fix(ios): give each list item's marker array its own hash

packages/react-native-enriched-markdown/ios/renderer/ListItemRenderer.m

@@ -19,6 +19,41 @@
 @implementation ENRMListMarkerDescriptor
 @end
 
+// NSArray's -hash is its count, so plain one-marker arrays all collide in the
+// table that uniques attribute dictionaries, and each list item probes past
+// every earlier one. Hashing by the item's own marker keeps rendering linear.
+@interface ENRMListMarkerArray : NSArray
+@end
+
+@implementation ENRMListMarkerArray {
+  NSArray<ENRMListMarkerDescriptor *> *_markers;
+}
+
+- (instancetype)initWithMarkers:(NSArray<ENRMListMarkerDescriptor *> *)markers
+{
+  if (self = [super init]) {
+    _markers = [markers copy];
+  }
+  return self;
+}
+
+- (NSUInteger)count
+{
+  return _markers.count;
+}
+
+- (id)objectAtIndex:(NSUInteger)index
+{
+  return _markers[index];
+}
+
+- (NSUInteger)hash
+{
+  return _markers.lastObject.hash;
+}
+
+@end
+
 @interface ListItemRenderer ()
 - (void)applyCheckedDecorationsTo:(NSMutableAttributedString *)output
                             range:(NSRange)range
@@ -184,7 +219,9 @@ - (void)renderNodeContent:(MarkdownASTNode *)node
   NSArray *existingMarkers = [output attribute:ListItemMarkerStartAttribute atIndex:anchorLocation effectiveRange:NULL];
   NSArray *markers =
       [existingMarkers isKindOfClass:[NSArray class]] ? [existingMarkers arrayByAddingObject:marker] : @[ marker ];
-  [output addAttribute:ListItemMarkerStartAttribute value:markers range:anchorRange];
+  [output addAttribute:ListItemMarkerStartAttribute
+                 value:[[ENRMListMarkerArray alloc] initWithMarkers:markers]
+                 range:anchorRange];
 
   if (isTask && isChecked) {
     [self applyCheckedDecorationsTo:output range:itemRange nestingLevel:nestingLevel];