diff --git a/sample/dictionary-extensions.ipynb b/sample/dictionary-extensions.ipynb
index cf4640e..c13a4bb 100644
--- a/sample/dictionary-extensions.ipynb
+++ b/sample/dictionary-extensions.ipynb
@@ -33,10 +33,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
    "outputs": [],
@@ -62,13 +65,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>95</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
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+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview td {\r\n",
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+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
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+     "output_type": "display_data"
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+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>82</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// GetValueOrDefault — returns value when key exists\n",
     "var scores = new Dictionary<string, int>\n",
@@ -83,13 +170,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>0</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
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+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
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+       ".dni-treeview td {\r\n",
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+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
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+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
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+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>&lt;null&gt;</pre></div><style>\r\n",
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+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// GetValueOrDefault — returns default(TValue) when key is not found\n",
     "display(DictionaryExtensions.GetValueOrDefault(scores, \"charlie\"));  // 0  (default for int)\n",
@@ -100,13 +271,106 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>0</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
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+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
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+       "    padding-left: 1em;\r\n",
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+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
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+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
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+       "    margin: 0em 0px !important;\r\n",
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+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
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+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>0</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "(2,25): warning CS8632: The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.\n",
+      "\n"
+     ]
+    }
+   ],
    "source": [
     "// GetValueOrDefault — null-safe: returns default when dict is null\n",
     "IDictionary<string, int>? nullDict = null;\n",
@@ -130,13 +394,66 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "Alice"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>False</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// GetOrAdd — returns existing value; factory is NOT called when key already exists\n",
     "var cache = new Dictionary<string, string> { [\"user:1\"] = \"Alice\" };\n",
@@ -154,13 +471,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "fetched-user:2"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "fetched-user:2"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// GetOrAdd — key missing: factory is called, result stored and returned\n",
     "var result2 = cache.GetOrAdd(\"user:2\", key => $\"fetched-{key}\");\n",
@@ -171,13 +510,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 8,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>[ 2, 4, 6 ]</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
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+     "output_type": "display_data"
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+     "data": {
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+       "<div class=\"dni-plaintext\"><pre>[ 1, 3 ]</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
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+       "    margin: 0em 0px;\r\n",
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+       "table tr td pre \r\n",
+       "{ \r\n",
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+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
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+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// GetOrAdd — practical use: lazy-initialise nested collections\n",
     "var grouped = new Dictionary<string, List<int>>();\n",
@@ -195,13 +618,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 9,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "null key: key"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "null factory: factory"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// GetOrAdd — throws ArgumentNullException for null key or null factory\n",
     "var d = new Dictionary<string, int>();\n",
@@ -229,13 +674,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 10,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<table><thead><tr><th><i>key</i></th><th>value</th></tr></thead><tbody><tr><td><div class=\"dni-plaintext\"><pre>timeout</pre></div></td><td><div class=\"dni-plaintext\"><pre>30</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>retries</pre></div></td><td><div class=\"dni-plaintext\"><pre>3</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>pageSize</pre></div></td><td><div class=\"dni-plaintext\"><pre>50</pre></div></td></tr></tbody></table><style>\r\n",
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+       "    font-style: italic;\r\n",
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+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
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+       "    margin: 0em 0px;\r\n",
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+       "{ \r\n",
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+       "</style>"
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+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Merge — no overlapping keys: all entries from other are added\n",
     "var defaults = new Dictionary<string, int> { [\"timeout\"] = 30, [\"retries\"] = 3 };\n",
@@ -247,13 +736,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "light"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "14"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Merge — overwrite: false (default) skips duplicate keys; existing values are kept\n",
     "var config = new Dictionary<string, string> { [\"theme\"] = \"light\", [\"lang\"] = \"en\" };\n",
@@ -266,13 +777,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 12,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "dark"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "14"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Merge — overwrite: true replaces existing values with values from other\n",
     "var base1 = new Dictionary<string, string> { [\"theme\"] = \"light\", [\"lang\"] = \"en\" };\n",
@@ -285,13 +818,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 13,
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    "source": [
     "// Merge — null other is silently ignored; returns same dict instance for chaining\n",
     "var dict1 = new Dictionary<string, int> { [\"a\"] = 1 };\n",
@@ -317,13 +934,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 14,
    "metadata": {
     "dotnet_interactive": {
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+       "<table><thead><tr><th><i>key</i></th><th>value</th></tr></thead><tbody><tr><td><div class=\"dni-plaintext\"><pre>apple</pre></div></td><td><div class=\"dni-plaintext\"><pre>10</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>banana</pre></div></td><td><div class=\"dni-plaintext\"><pre>5</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>cherry</pre></div></td><td><div class=\"dni-plaintext\"><pre>20</pre></div></td></tr></tbody></table><style>\r\n",
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    "source": [
     "// AddRange — adds all pairs from a list; returns same dict for chaining\n",
     "var inventory = new Dictionary<string, int> { [\"apple\"] = 10 };\n",
@@ -339,13 +1000,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 15,
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     "dotnet_interactive": {
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+       "<div class=\"dni-plaintext\"><pre>10</pre></div><style>\r\n",
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+       "    text-align: start;\r\n",
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+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
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+       "table th {\r\n",
+       "    text-align: start;\r\n",
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+       "<div class=\"dni-plaintext\"><pre>15</pre></div><style>\r\n",
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+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
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    "source": [
     "// AddRange — overwrite: false (default) keeps existing values for duplicate keys\n",
     "var inv2 = new Dictionary<string, int> { [\"apple\"] = 10, [\"banana\"] = 5 };\n",
@@ -358,13 +1103,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
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+       "<div class=\"dni-plaintext\"><pre>99</pre></div><style>\r\n",
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    "source": [
     "// AddRange — overwrite: true replaces existing values\n",
     "var inv3 = new Dictionary<string, int> { [\"apple\"] = 10, [\"banana\"] = 5 };\n",
@@ -377,13 +1206,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 17,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<table><thead><tr><th><i>key</i></th><th>value</th></tr></thead><tbody><tr><td><div class=\"dni-plaintext\"><pre>USD</pre></div></td><td><div class=\"dni-plaintext\"><pre>1</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>GBP</pre></div></td><td><div class=\"dni-plaintext\"><pre>1.1</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>EUR</pre></div></td><td><div class=\"dni-plaintext\"><pre>1.2</pre></div></td></tr></tbody></table><style>\r\n",
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+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
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+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
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+       "</style>"
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+    }
+   ],
    "source": [
     "// AddRange — works with any IEnumerable<KeyValuePair>; here from a LINQ projection\n",
     "var codes = new[] { \"USD\", \"GBP\", \"EUR\" };\n",
@@ -395,13 +1268,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 18,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
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+   "outputs": [
+    {
+     "data": {
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+       "<div class=\"dni-plaintext\"><pre>1</pre></div><style>\r\n",
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+   ],
    "source": [
     "// AddRange — null pairs are silently ignored\n",
     "var inv4 = new Dictionary<string, int> { [\"a\"] = 1 };\n",
@@ -425,13 +1342,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 19,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
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    },
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+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<table><thead><tr><th><i>key</i></th><th>value</th></tr></thead><tbody><tr><td><div class=\"dni-plaintext\"><pre>db.host</pre></div></td><td><div class=\"dni-plaintext\"><pre>localhost</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>db.port</pre></div></td><td><div class=\"dni-plaintext\"><pre>5432</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>app.name</pre></div></td><td><div class=\"dni-plaintext\"><pre>MyApp</pre></div></td></tr></tbody></table><style>\r\n",
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    "source": [
     "// RemoveWhere — removes all keys matching the predicate\n",
     "var settings = new Dictionary<string, string>\n",
@@ -449,13 +1410,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 20,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
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    },
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+       "<div class=\"dni-plaintext\"><pre>2</pre></div><style>\r\n",
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+       "}\r\n",
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+   ],
    "source": [
     "// RemoveWhere — no matching keys: dict is unchanged\n",
     "var nums = new Dictionary<string, int> { [\"a\"] = 1, [\"b\"] = 2 };\n",
@@ -465,13 +1470,97 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 21,
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    },
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    "source": [
     "// RemoveWhere — returns same dict instance for chaining\n",
     "var env = new Dictionary<string, string>\n",
@@ -490,13 +1579,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 22,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
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+       "null predicate: predicate"
+      ]
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     "// RemoveWhere — throws ArgumentNullException for null predicate\n",
     "var d2 = new Dictionary<string, int> { [\"a\"] = 1 };\n",
@@ -525,13 +1627,137 @@
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    "source": [
     "// AsReadOnly — wraps the dict as IReadOnlyDictionary; reads work normally\n",
     "var prices = new Dictionary<string, decimal>\n",
@@ -548,13 +1774,137 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 24,
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    "source": [
     "// AsReadOnly — live view: mutations to the underlying dict are visible through the wrapper\n",
     "var source = new Dictionary<string, int> { [\"a\"] = 1 };\n",
@@ -569,13 +1919,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 25,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
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+     "languageId": "csharp"
     }
    },
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+    {
+     "data": {
+      "text/plain": [
+       "null dict: dict"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// AsReadOnly — throws ArgumentNullException for null dict\n",
     "try { DictionaryExtensions.AsReadOnly<string, int>(null!); }\n",
@@ -602,13 +1965,84 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 26,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
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+     "languageId": "csharp"
     }
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+      "text/plain": [
+       "warn"
+      ]
+     },
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+       "20"
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    "source": [
     "var appDefaults = new Dictionary<string, string>\n",
     "{\n",
@@ -648,13 +2082,57 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 27,
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+       "<table><thead><tr><th><i>key</i></th><th>value</th></tr></thead><tbody><tr><td><div class=\"dni-plaintext\"><pre>v2/orders</pre></div></td><td><div class=\"dni-plaintext\"><pre>OrderHandlerV2</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>v2/products</pre></div></td><td><div class=\"dni-plaintext\"><pre>ProductHandlerV2</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>health</pre></div></td><td><div class=\"dni-plaintext\"><pre>HealthHandler</pre></div></td></tr></tbody></table><style>\r\n",
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    "source": [
     "// Start with some registered handlers\n",
     "var handlers = new Dictionary<string, string> { [\"v1/orders\"] = \"OrderHandlerV1\" };\n",
@@ -687,13 +2165,137 @@
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   {
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Accumulate events into per-type buckets\n",
     "var buckets = new Dictionary<string, List<string>>();\n",
@@ -728,13 +2330,44 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 29,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "9090"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "prod.example.com"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "false"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Highest-priority source first; each subsequent merge skips already-set keys\n",
     "var commandLine = new Dictionary<string, string> { [\"port\"] = \"9090\" };\n",
@@ -761,13 +2394,137 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 30,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
+    },
+    "vscode": {
+     "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>55</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>6765</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>19</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Cheap probe with GetValueOrDefault before the more expensive GetOrAdd\n",
     "var memo = new Dictionary<int, long>();\n",
@@ -793,7 +2550,11 @@
    "name": ".net-csharp"
   },
   "language_info": {
-   "name": "polyglot-notebook"
+   "file_extension": ".cs",
+   "mimetype": "text/x-csharp",
+   "name": "C#",
+   "pygments_lexer": "csharp",
+   "version": "13.0"
   },
   "polyglot_notebook": {
    "kernelInfo": {
diff --git a/sample/enumerable-extension.ipynb b/sample/enumerable-extension.ipynb
index bb8e83b..fbc3370 100644
--- a/sample/enumerable-extension.ipynb
+++ b/sample/enumerable-extension.ipynb
@@ -40,14 +40,130 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": 1,
    "id": "2a22ea16",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "\r\n",
+       "<div>\r\n",
+       "    <div id='dotnet-interactive-this-cell-$CACHE_BUSTER$' style='display: none'>\r\n",
+       "        The below script needs to be able to find the current output cell; this is an easy method to get it.\r\n",
+       "    </div>\r\n",
+       "    <script type='text/javascript'>\r\n",
+       "async function probeAddresses(probingAddresses) {\r\n",
+       "    function timeout(ms, promise) {\r\n",
+       "        return new Promise(function (resolve, reject) {\r\n",
+       "            setTimeout(function () {\r\n",
+       "                reject(new Error('timeout'))\r\n",
+       "            }, ms)\r\n",
+       "            promise.then(resolve, reject)\r\n",
+       "        })\r\n",
+       "    }\r\n",
+       "\r\n",
+       "    if (Array.isArray(probingAddresses)) {\r\n",
+       "        for (let i = 0; i < probingAddresses.length; i++) {\r\n",
+       "\r\n",
+       "            let rootUrl = probingAddresses[i];\r\n",
+       "\r\n",
+       "            if (!rootUrl.endsWith('/')) {\r\n",
+       "                rootUrl = `${rootUrl}/`;\r\n",
+       "            }\r\n",
+       "\r\n",
+       "            try {\r\n",
+       "                let response = await timeout(1000, fetch(`${rootUrl}discovery`, {\r\n",
+       "                    method: 'POST',\r\n",
+       "                    cache: 'no-cache',\r\n",
+       "                    mode: 'cors',\r\n",
+       "                    timeout: 1000,\r\n",
+       "                    headers: {\r\n",
+       "                        'Content-Type': 'text/plain'\r\n",
+       "                    },\r\n",
+       "                    body: probingAddresses[i]\r\n",
+       "                }));\r\n",
+       "\r\n",
+       "                if (response.status == 200) {\r\n",
+       "                    return rootUrl;\r\n",
+       "                }\r\n",
+       "            }\r\n",
+       "            catch (e) { }\r\n",
+       "        }\r\n",
+       "    }\r\n",
+       "}\r\n",
+       "\r\n",
+       "function loadDotnetInteractiveApi() {\r\n",
+       "    probeAddresses([\"http://127.0.0.1:2048/\",\"http://::1:2048/\",\"http://fe80::1%1:2048/\",\"http://fe80::2b07:dade:9702:73a6%19:2048/\",\"http://fe80::473:dcb0:15ff:7888%15:2048/\",\"http://fdc6:4c17:35e9:1:183d:d763:6ac6:27a8:2048/\",\"http://2601:402:4500:e98:1c95:155e:db5e:9d99:2048/\",\"http://2601:402:4500:e98:e073:d687:6c09:a0ea:2048/\",\"http://192.168.4.24:2048/\",\"http://2601:402:4500:e98:d19f:910a:a17a:ee1c:2048/\",\"http://fe80::ab9b:ef28:ad73:eb85%20:2048/\",\"http://fe80::3bd8:aab0:50df:b3f3%21:2048/\",\"http://fe80::ce81:b1c:bd2c:69e%22:2048/\",\"http://fe80::451:f3ff:fe8e:c1ff%17:2048/\",\"http://fe80::bed6:4b04:d1a2:ecf4%23:2048/\",\"http://fe80::ad32:d11c:9b67:4a9%24:2048/\",\"http://fe80::d01e:6fcc:8952:b555%25:2048/\",\"http://fe80::cf09:735d:f419:eb23%26:2048/\"])\r\n",
+       "        .then((root) => {\r\n",
+       "        // use probing to find host url and api resources\r\n",
+       "        // load interactive helpers and language services\r\n",
+       "        let dotnetInteractiveRequire = require.config({\r\n",
+       "        context: '74281.Microsoft.DotNet.Interactive.Http.HttpPort',\r\n",
+       "                paths:\r\n",
+       "            {\r\n",
+       "                'dotnet-interactive': `${root}resources`\r\n",
+       "                }\r\n",
+       "        }) || require;\r\n",
+       "\r\n",
+       "            window.dotnetInteractiveRequire = dotnetInteractiveRequire;\r\n",
+       "\r\n",
+       "            window.configureRequireFromExtension = function(extensionName, extensionCacheBuster) {\r\n",
+       "                let paths = {};\r\n",
+       "                paths[extensionName] = `${root}extensions/${extensionName}/resources/`;\r\n",
+       "                \r\n",
+       "                let internalRequire = require.config({\r\n",
+       "                    context: extensionCacheBuster,\r\n",
+       "                    paths: paths,\r\n",
+       "                    urlArgs: `cacheBuster=${extensionCacheBuster}`\r\n",
+       "                    }) || require;\r\n",
+       "\r\n",
+       "                return internalRequire\r\n",
+       "            };\r\n",
+       "        \r\n",
+       "            dotnetInteractiveRequire([\r\n",
+       "                    'dotnet-interactive/dotnet-interactive'\r\n",
+       "                ],\r\n",
+       "                function (dotnet) {\r\n",
+       "                    dotnet.init(window);\r\n",
+       "                },\r\n",
+       "                function (error) {\r\n",
+       "                    console.log(error);\r\n",
+       "                }\r\n",
+       "            );\r\n",
+       "        })\r\n",
+       "        .catch(error => {console.log(error);});\r\n",
+       "    }\r\n",
+       "\r\n",
+       "// ensure `require` is available globally\r\n",
+       "if ((typeof(require) !==  typeof(Function)) || (typeof(require.config) !== typeof(Function))) {\r\n",
+       "    let require_script = document.createElement('script');\r\n",
+       "    require_script.setAttribute('src', 'https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js');\r\n",
+       "    require_script.setAttribute('type', 'text/javascript');\r\n",
+       "    \r\n",
+       "    \r\n",
+       "    require_script.onload = function() {\r\n",
+       "        loadDotnetInteractiveApi();\r\n",
+       "    };\r\n",
+       "\r\n",
+       "    document.getElementsByTagName('head')[0].appendChild(require_script);\r\n",
+       "}\r\n",
+       "else {\r\n",
+       "    loadDotnetInteractiveApi();\r\n",
+       "}\r\n",
+       "\r\n",
+       "    </script>\r\n",
+       "</div>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "#r \"../src/CSharpHelperExtensions/bin/Debug/net10.0/CSharpHelperExtensions.dll\"\n",
     "using System.Collections.Generic;\n",
@@ -73,7 +189,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": 2,
    "id": "dc1aecc2",
    "metadata": {
     "vscode": {
@@ -211,7 +327,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 34,
+   "execution_count": 3,
    "id": "e4d5ada6",
    "metadata": {
     "vscode": {
@@ -349,7 +465,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": 4,
    "id": "255332dc",
    "metadata": {
     "vscode": {
@@ -502,7 +618,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
+   "execution_count": 5,
    "id": "aac4c3a5",
    "metadata": {
     "vscode": {
@@ -612,7 +728,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 37,
+   "execution_count": 6,
    "id": "ced3e752",
    "metadata": {
     "vscode": {
@@ -753,7 +869,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 38,
+   "execution_count": 7,
    "id": "7ba7ca89",
    "metadata": {
     "vscode": {
@@ -908,7 +1024,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 39,
+   "execution_count": 8,
    "id": "a5133163",
    "metadata": {
     "vscode": {
@@ -1049,7 +1165,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 40,
+   "execution_count": 9,
    "id": "1adf5527",
    "metadata": {
     "vscode": {
@@ -1102,7 +1218,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 41,
+   "execution_count": 10,
    "id": "fc43af2c",
    "metadata": {
     "vscode": {
@@ -1202,7 +1318,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": 11,
    "id": "5679cade",
    "metadata": {
     "vscode": {
@@ -1406,7 +1522,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 43,
+   "execution_count": 12,
    "id": "b9371ca6",
    "metadata": {
     "vscode": {
@@ -1513,7 +1629,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 44,
+   "execution_count": 13,
    "id": "8fcab453",
    "metadata": {
     "vscode": {
@@ -1630,7 +1746,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 45,
+   "execution_count": 14,
    "id": "6da80bb9",
    "metadata": {
     "vscode": {
@@ -1727,7 +1843,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 46,
+   "execution_count": 15,
    "id": "658b80b3",
    "metadata": {
     "vscode": {
@@ -1865,7 +1981,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 47,
+   "execution_count": 16,
    "id": "a2e745fe",
    "metadata": {
     "vscode": {
@@ -1943,7 +2059,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 48,
+   "execution_count": 17,
    "id": "a954abfc",
    "metadata": {
     "vscode": {
@@ -2081,7 +2197,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 49,
+   "execution_count": 18,
    "id": "644e29d5",
    "metadata": {
     "vscode": {
@@ -2260,7 +2376,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 50,
+   "execution_count": 19,
    "id": "cd0af8d8",
    "metadata": {
     "vscode": {
@@ -2439,7 +2555,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 51,
+   "execution_count": 20,
    "id": "ead2788c",
    "metadata": {
     "vscode": {
@@ -2634,7 +2750,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 52,
+   "execution_count": 21,
    "id": "9ba17fa3",
    "metadata": {
     "vscode": {
@@ -2733,7 +2849,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 53,
+   "execution_count": 22,
    "id": "95cc5bff",
    "metadata": {
     "vscode": {
@@ -2917,7 +3033,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 54,
+   "execution_count": 23,
    "id": "d554fff6",
    "metadata": {
     "vscode": {
@@ -3139,7 +3255,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 55,
+   "execution_count": 24,
    "id": "dbb983f6",
    "metadata": {
     "vscode": {
@@ -3254,7 +3370,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 56,
+   "execution_count": 25,
    "id": "d038da52",
    "metadata": {
     "vscode": {
@@ -3392,7 +3508,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 57,
+   "execution_count": 26,
    "id": "ede991cb",
    "metadata": {
     "vscode": {
@@ -3530,7 +3646,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 58,
+   "execution_count": 27,
    "id": "09895039",
    "metadata": {
     "vscode": {
@@ -3647,7 +3763,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 59,
+   "execution_count": 28,
    "id": "94da3458",
    "metadata": {
     "vscode": {
@@ -3710,7 +3826,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": 29,
    "id": "2e3539f8",
    "metadata": {
     "vscode": {
diff --git a/sample/string-extensions.ipynb b/sample/string-extensions.ipynb
index ea0e0c4..1545f88 100644
--- a/sample/string-extensions.ipynb
+++ b/sample/string-extensions.ipynb
@@ -37,13 +37,129 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "\r\n",
+       "<div>\r\n",
+       "    <div id='dotnet-interactive-this-cell-$CACHE_BUSTER$' style='display: none'>\r\n",
+       "        The below script needs to be able to find the current output cell; this is an easy method to get it.\r\n",
+       "    </div>\r\n",
+       "    <script type='text/javascript'>\r\n",
+       "async function probeAddresses(probingAddresses) {\r\n",
+       "    function timeout(ms, promise) {\r\n",
+       "        return new Promise(function (resolve, reject) {\r\n",
+       "            setTimeout(function () {\r\n",
+       "                reject(new Error('timeout'))\r\n",
+       "            }, ms)\r\n",
+       "            promise.then(resolve, reject)\r\n",
+       "        })\r\n",
+       "    }\r\n",
+       "\r\n",
+       "    if (Array.isArray(probingAddresses)) {\r\n",
+       "        for (let i = 0; i < probingAddresses.length; i++) {\r\n",
+       "\r\n",
+       "            let rootUrl = probingAddresses[i];\r\n",
+       "\r\n",
+       "            if (!rootUrl.endsWith('/')) {\r\n",
+       "                rootUrl = `${rootUrl}/`;\r\n",
+       "            }\r\n",
+       "\r\n",
+       "            try {\r\n",
+       "                let response = await timeout(1000, fetch(`${rootUrl}discovery`, {\r\n",
+       "                    method: 'POST',\r\n",
+       "                    cache: 'no-cache',\r\n",
+       "                    mode: 'cors',\r\n",
+       "                    timeout: 1000,\r\n",
+       "                    headers: {\r\n",
+       "                        'Content-Type': 'text/plain'\r\n",
+       "                    },\r\n",
+       "                    body: probingAddresses[i]\r\n",
+       "                }));\r\n",
+       "\r\n",
+       "                if (response.status == 200) {\r\n",
+       "                    return rootUrl;\r\n",
+       "                }\r\n",
+       "            }\r\n",
+       "            catch (e) { }\r\n",
+       "        }\r\n",
+       "    }\r\n",
+       "}\r\n",
+       "\r\n",
+       "function loadDotnetInteractiveApi() {\r\n",
+       "    probeAddresses([\"http://127.0.0.1:2049/\",\"http://::1:2049/\",\"http://fe80::1%1:2049/\",\"http://fe80::2b07:dade:9702:73a6%19:2049/\",\"http://fe80::473:dcb0:15ff:7888%15:2049/\",\"http://fdc6:4c17:35e9:1:183d:d763:6ac6:27a8:2049/\",\"http://2601:402:4500:e98:1c95:155e:db5e:9d99:2049/\",\"http://2601:402:4500:e98:e073:d687:6c09:a0ea:2049/\",\"http://192.168.4.24:2049/\",\"http://2601:402:4500:e98:d19f:910a:a17a:ee1c:2049/\",\"http://fe80::ab9b:ef28:ad73:eb85%20:2049/\",\"http://fe80::3bd8:aab0:50df:b3f3%21:2049/\",\"http://fe80::ce81:b1c:bd2c:69e%22:2049/\",\"http://fe80::451:f3ff:fe8e:c1ff%17:2049/\",\"http://fe80::bed6:4b04:d1a2:ecf4%23:2049/\",\"http://fe80::ad32:d11c:9b67:4a9%24:2049/\",\"http://fe80::d01e:6fcc:8952:b555%25:2049/\",\"http://fe80::cf09:735d:f419:eb23%26:2049/\"])\r\n",
+       "        .then((root) => {\r\n",
+       "        // use probing to find host url and api resources\r\n",
+       "        // load interactive helpers and language services\r\n",
+       "        let dotnetInteractiveRequire = require.config({\r\n",
+       "        context: '74329.Microsoft.DotNet.Interactive.Http.HttpPort',\r\n",
+       "                paths:\r\n",
+       "            {\r\n",
+       "                'dotnet-interactive': `${root}resources`\r\n",
+       "                }\r\n",
+       "        }) || require;\r\n",
+       "\r\n",
+       "            window.dotnetInteractiveRequire = dotnetInteractiveRequire;\r\n",
+       "\r\n",
+       "            window.configureRequireFromExtension = function(extensionName, extensionCacheBuster) {\r\n",
+       "                let paths = {};\r\n",
+       "                paths[extensionName] = `${root}extensions/${extensionName}/resources/`;\r\n",
+       "                \r\n",
+       "                let internalRequire = require.config({\r\n",
+       "                    context: extensionCacheBuster,\r\n",
+       "                    paths: paths,\r\n",
+       "                    urlArgs: `cacheBuster=${extensionCacheBuster}`\r\n",
+       "                    }) || require;\r\n",
+       "\r\n",
+       "                return internalRequire\r\n",
+       "            };\r\n",
+       "        \r\n",
+       "            dotnetInteractiveRequire([\r\n",
+       "                    'dotnet-interactive/dotnet-interactive'\r\n",
+       "                ],\r\n",
+       "                function (dotnet) {\r\n",
+       "                    dotnet.init(window);\r\n",
+       "                },\r\n",
+       "                function (error) {\r\n",
+       "                    console.log(error);\r\n",
+       "                }\r\n",
+       "            );\r\n",
+       "        })\r\n",
+       "        .catch(error => {console.log(error);});\r\n",
+       "    }\r\n",
+       "\r\n",
+       "// ensure `require` is available globally\r\n",
+       "if ((typeof(require) !==  typeof(Function)) || (typeof(require.config) !== typeof(Function))) {\r\n",
+       "    let require_script = document.createElement('script');\r\n",
+       "    require_script.setAttribute('src', 'https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js');\r\n",
+       "    require_script.setAttribute('type', 'text/javascript');\r\n",
+       "    \r\n",
+       "    \r\n",
+       "    require_script.onload = function() {\r\n",
+       "        loadDotnetInteractiveApi();\r\n",
+       "    };\r\n",
+       "\r\n",
+       "    document.getElementsByTagName('head')[0].appendChild(require_script);\r\n",
+       "}\r\n",
+       "else {\r\n",
+       "    loadDotnetInteractiveApi();\r\n",
+       "}\r\n",
+       "\r\n",
+       "    </script>\r\n",
+       "</div>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "#r \"../src/CSharpHelperExtensions/bin/Debug/net10.0/CSharpHelperExtensions.dll\"\n",
     "using CSharpHelperExtensions;         // IsNullOrEmpty, In, IsBetween, ToJson\n",
@@ -67,7 +183,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 2,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -286,7 +402,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 3,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -423,7 +539,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 4,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -465,7 +581,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 5,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -523,7 +639,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 6,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -711,7 +827,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 7,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -972,7 +1088,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 8,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1262,7 +1378,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 9,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1304,7 +1420,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": 10,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1356,7 +1472,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 11,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1410,7 +1526,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 12,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1460,7 +1576,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": 13,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1512,7 +1628,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": 14,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1577,7 +1693,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 15,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1629,7 +1745,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": 16,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1691,7 +1807,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 17,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -1828,7 +1944,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 18,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2006,7 +2122,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 21,
+   "execution_count": 19,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2200,7 +2316,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 22,
+   "execution_count": 20,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2244,7 +2360,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": 21,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2288,7 +2404,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
+   "execution_count": 22,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2357,7 +2473,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 23,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2535,7 +2651,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 24,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2581,7 +2697,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 25,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2629,7 +2745,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 26,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2807,7 +2923,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": 27,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -2944,7 +3060,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": 28,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -3096,7 +3212,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
+   "execution_count": 29,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -3173,7 +3289,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": 30,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
@@ -3231,7 +3347,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": 31,
    "metadata": {
     "vscode": {
      "languageId": "csharp"
diff --git a/sample/value-extensions.ipynb b/sample/value-extensions.ipynb
index 6bb3f25..6c053c0 100644
--- a/sample/value-extensions.ipynb
+++ b/sample/value-extensions.ipynb
@@ -32,14 +32,130 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "id": "c9d0e1f2",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "\r\n",
+       "<div>\r\n",
+       "    <div id='dotnet-interactive-this-cell-$CACHE_BUSTER$' style='display: none'>\r\n",
+       "        The below script needs to be able to find the current output cell; this is an easy method to get it.\r\n",
+       "    </div>\r\n",
+       "    <script type='text/javascript'>\r\n",
+       "async function probeAddresses(probingAddresses) {\r\n",
+       "    function timeout(ms, promise) {\r\n",
+       "        return new Promise(function (resolve, reject) {\r\n",
+       "            setTimeout(function () {\r\n",
+       "                reject(new Error('timeout'))\r\n",
+       "            }, ms)\r\n",
+       "            promise.then(resolve, reject)\r\n",
+       "        })\r\n",
+       "    }\r\n",
+       "\r\n",
+       "    if (Array.isArray(probingAddresses)) {\r\n",
+       "        for (let i = 0; i < probingAddresses.length; i++) {\r\n",
+       "\r\n",
+       "            let rootUrl = probingAddresses[i];\r\n",
+       "\r\n",
+       "            if (!rootUrl.endsWith('/')) {\r\n",
+       "                rootUrl = `${rootUrl}/`;\r\n",
+       "            }\r\n",
+       "\r\n",
+       "            try {\r\n",
+       "                let response = await timeout(1000, fetch(`${rootUrl}discovery`, {\r\n",
+       "                    method: 'POST',\r\n",
+       "                    cache: 'no-cache',\r\n",
+       "                    mode: 'cors',\r\n",
+       "                    timeout: 1000,\r\n",
+       "                    headers: {\r\n",
+       "                        'Content-Type': 'text/plain'\r\n",
+       "                    },\r\n",
+       "                    body: probingAddresses[i]\r\n",
+       "                }));\r\n",
+       "\r\n",
+       "                if (response.status == 200) {\r\n",
+       "                    return rootUrl;\r\n",
+       "                }\r\n",
+       "            }\r\n",
+       "            catch (e) { }\r\n",
+       "        }\r\n",
+       "    }\r\n",
+       "}\r\n",
+       "\r\n",
+       "function loadDotnetInteractiveApi() {\r\n",
+       "    probeAddresses([\"http://127.0.0.1:2050/\",\"http://::1:2050/\",\"http://fe80::1%1:2050/\",\"http://fe80::2b07:dade:9702:73a6%19:2050/\",\"http://fe80::473:dcb0:15ff:7888%15:2050/\",\"http://fdc6:4c17:35e9:1:183d:d763:6ac6:27a8:2050/\",\"http://2601:402:4500:e98:1c95:155e:db5e:9d99:2050/\",\"http://2601:402:4500:e98:e073:d687:6c09:a0ea:2050/\",\"http://192.168.4.24:2050/\",\"http://2601:402:4500:e98:d19f:910a:a17a:ee1c:2050/\",\"http://fe80::ab9b:ef28:ad73:eb85%20:2050/\",\"http://fe80::3bd8:aab0:50df:b3f3%21:2050/\",\"http://fe80::ce81:b1c:bd2c:69e%22:2050/\",\"http://fe80::451:f3ff:fe8e:c1ff%17:2050/\",\"http://fe80::bed6:4b04:d1a2:ecf4%23:2050/\",\"http://fe80::ad32:d11c:9b67:4a9%24:2050/\",\"http://fe80::d01e:6fcc:8952:b555%25:2050/\",\"http://fe80::cf09:735d:f419:eb23%26:2050/\"])\r\n",
+       "        .then((root) => {\r\n",
+       "        // use probing to find host url and api resources\r\n",
+       "        // load interactive helpers and language services\r\n",
+       "        let dotnetInteractiveRequire = require.config({\r\n",
+       "        context: '74382.Microsoft.DotNet.Interactive.Http.HttpPort',\r\n",
+       "                paths:\r\n",
+       "            {\r\n",
+       "                'dotnet-interactive': `${root}resources`\r\n",
+       "                }\r\n",
+       "        }) || require;\r\n",
+       "\r\n",
+       "            window.dotnetInteractiveRequire = dotnetInteractiveRequire;\r\n",
+       "\r\n",
+       "            window.configureRequireFromExtension = function(extensionName, extensionCacheBuster) {\r\n",
+       "                let paths = {};\r\n",
+       "                paths[extensionName] = `${root}extensions/${extensionName}/resources/`;\r\n",
+       "                \r\n",
+       "                let internalRequire = require.config({\r\n",
+       "                    context: extensionCacheBuster,\r\n",
+       "                    paths: paths,\r\n",
+       "                    urlArgs: `cacheBuster=${extensionCacheBuster}`\r\n",
+       "                    }) || require;\r\n",
+       "\r\n",
+       "                return internalRequire\r\n",
+       "            };\r\n",
+       "        \r\n",
+       "            dotnetInteractiveRequire([\r\n",
+       "                    'dotnet-interactive/dotnet-interactive'\r\n",
+       "                ],\r\n",
+       "                function (dotnet) {\r\n",
+       "                    dotnet.init(window);\r\n",
+       "                },\r\n",
+       "                function (error) {\r\n",
+       "                    console.log(error);\r\n",
+       "                }\r\n",
+       "            );\r\n",
+       "        })\r\n",
+       "        .catch(error => {console.log(error);});\r\n",
+       "    }\r\n",
+       "\r\n",
+       "// ensure `require` is available globally\r\n",
+       "if ((typeof(require) !==  typeof(Function)) || (typeof(require.config) !== typeof(Function))) {\r\n",
+       "    let require_script = document.createElement('script');\r\n",
+       "    require_script.setAttribute('src', 'https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js');\r\n",
+       "    require_script.setAttribute('type', 'text/javascript');\r\n",
+       "    \r\n",
+       "    \r\n",
+       "    require_script.onload = function() {\r\n",
+       "        loadDotnetInteractiveApi();\r\n",
+       "    };\r\n",
+       "\r\n",
+       "    document.getElementsByTagName('head')[0].appendChild(require_script);\r\n",
+       "}\r\n",
+       "else {\r\n",
+       "    loadDotnetInteractiveApi();\r\n",
+       "}\r\n",
+       "\r\n",
+       "    </script>\r\n",
+       "</div>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "#r \"../src/CSharpHelperExtensions/bin/Debug/net10.0/CSharpHelperExtensions.dll\"\n",
     "using CSharpHelperExtensions.Values;  // In, IsBetween, BetweenComparison, ToJson"
@@ -62,14 +178,135 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "id": "e7f8a9b0",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>False</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// String membership — role check\n",
     "display(\"admin\".In(\"admin\", \"superadmin\"));   // True\n",
@@ -79,14 +316,135 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "id": "c1d2e3f4",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
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+     "output_type": "display_data"
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+       "<div class=\"dni-plaintext\"><pre>False</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
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+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
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+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
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+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Integer membership\n",
     "display(3.In(1, 2, 3, 4));   // True\n",
@@ -96,14 +454,95 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "id": "a5b6c7d8",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>False</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
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+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>False</pre></div><style>\r\n",
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+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
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+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Empty set — always false\n",
     "display(\"x\".In());           // False  (no candidates supplied)\n",
@@ -112,14 +551,135 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "id": "e9f0a1b2",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
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+       ".dni-treeview {\r\n",
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+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
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+       "    margin: 0em 0px;\r\n",
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+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
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+     "metadata": {},
+     "output_type": "display_data"
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+    {
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+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
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+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Enum membership\n",
     "enum HttpMethod { Get, Post, Put, Delete, Patch }\n",
@@ -151,14 +711,215 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 6,
    "id": "a7b8c9d0",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
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+       "    white-space: nowrap;\r\n",
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+       ".dni-treeview td {\r\n",
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+       "table td {\r\n",
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+       "</style>"
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+       "</style>"
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+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
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+       "{ \r\n",
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+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// BetweenComparison.None (default) — inclusive on both ends\n",
     "display(5.IsBetween(1, 10));    // True   (interior)\n",
@@ -170,14 +931,135 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "id": "e1f2a3b4",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
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+       ".dni-treeview {\r\n",
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+   ],
    "source": [
     "// BetweenComparison.ExcludeBoth — exclusive on both ends\n",
     "display(5.IsBetween(1, 10, BetweenComparison.ExcludeBoth));    // True   (interior)\n",
@@ -187,14 +1069,135 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 8,
    "id": "c5d6e7f8",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
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+   ],
    "source": [
     "// BetweenComparison.ExcludeLower — exclusive lower, inclusive upper\n",
     "display(5.IsBetween(1, 10, BetweenComparison.ExcludeLower));    // True\n",
@@ -204,14 +1207,135 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 9,
    "id": "a9b0c1d2",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
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+       "table td {\r\n",
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+       "</style>"
+      ]
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+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// BetweenComparison.ExcludeUpper — inclusive lower, exclusive upper\n",
     "display(5.IsBetween(1, 10, BetweenComparison.ExcludeUpper));    // True\n",
@@ -221,14 +1345,215 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 10,
    "id": "e3f4a5b6",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>True</pre></div><style>\r\n",
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+    },
+    {
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+       "<div class=\"dni-plaintext\"><pre>False</pre></div><style>\r\n",
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+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Works on any IComparable<T> — DateTime and string\n",
     "\n",
@@ -264,14 +1589,33 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 11,
    "id": "a1b2e3f4",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{\"Name\":\"Alice\",\"Age\":30}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "{\"Tags\":[\"a\",\"b\",\"c\"],\"Active\":true}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Compact output (default)\n",
     "display(new { Name = \"Alice\", Age = 30 }.ToJson());   // {\"Name\":\"Alice\",\"Age\":30}\n",
@@ -283,14 +1627,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 12,
    "id": "c5d6f7a8",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{\n",
+       "  \"Name\": \"Alice\",\n",
+       "  \"Age\": 30\n",
+       "}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Indented (pretty-printed) output\n",
     "display(new { Name = \"Alice\", Age = 30 }.ToJson(indentation: true));\n",
@@ -302,14 +1659,51 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 13,
    "id": "b9c0d1e2",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "42"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "true"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "3.14"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "\"2024-06-15T00:00:00\""
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Value types — works directly on int, bool, DateTime, etc.\n",
     "display(42.ToJson());                 // 42\n",
@@ -320,14 +1714,95 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 14,
    "id": "f3a4b5c6",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>&lt;null&gt;</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/html": [
+       "<div class=\"dni-plaintext\"><pre>&lt;null&gt;</pre></div><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Null-safe — returns null for null input (no exception)\n",
     "display(((object)null).ToJson());    // null\n",
@@ -357,14 +1832,69 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 15,
    "id": "f5a6b7c8",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "  -5: invalid score"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "   0: F"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "  45: F"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "  75: B"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "  90: A"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       " 101: invalid score"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Categorise a score only when it falls in the valid range [0, 100]\n",
     "int[] scores = { -5, 0, 45, 75, 90, 101 };\n",
@@ -402,14 +1932,46 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 16,
    "id": "e5f6a7b9",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "Can write:  True"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "Can delete: False"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "{\n",
+       "  \"Name\": \"Carol\",\n",
+       "  \"Role\": \"editor\",\n",
+       "  \"Action\": \"login\"\n",
+       "}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "var user = new { Name = \"Carol\", Role = \"editor\", LastLogin = \"2024-06-15\" };\n",
     "\n",
@@ -443,14 +2005,42 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 17,
    "id": "a8b9c0d1",
    "metadata": {
     "vscode": {
      "languageId": "csharp"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{\"Status\":\"succeeded\",\"Timestamp\":\"2024-06-15T12:00:00Z\"}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "{\"Status\":\"failed\",\"Timestamp\":\"2024-06-15T12:00:00Z\"}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "{\"Status\":\"cancelled\",\"Timestamp\":\"2024-06-15T12:00:00Z\"}"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "// Emit a JSON status event only for terminal states; ignore transient ones\n",
     "string[] statuses = { \"pending\", \"running\", \"succeeded\", \"failed\", \"cancelled\" };\n",
@@ -478,7 +2068,11 @@
    "name": ".net-csharp"
   },
   "language_info": {
-   "name": "C#"
+   "file_extension": ".cs",
+   "mimetype": "text/x-csharp",
+   "name": "C#",
+   "pygments_lexer": "csharp",
+   "version": "13.0"
   }
  },
  "nbformat": 4,