Use covariant types for multibind collections/mappings

[davidparsson]

To allow passing type checking without having to explicitly declare types.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.54%. Comparing base (602caec) to head (1589f3f).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #307   +/-   ##
=======================================
  Coverage   96.54%   96.54%           
=======================================
  Files           1        1           
  Lines         608      608           
  Branches      103      103           
=======================================
  Hits          587      587           
  Misses         15       15           
  Partials        6        6           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull request overview

This PR updates the multibind method to accept covariant collection types (Collection and Mapping) instead of concrete types (list and dict). This change allows callers to pass subtypes like tuples or immutable mappings without explicit type declarations, improving type checking compatibility.

Key changes:

• Runtime type checks updated from list to Collection and dict to Mapping
• Type signatures updated to accept Collection[Union[T, Type[T]]] and Mapping[K, Union[V, Type[V]]] instead of concrete List and Dict types

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Using isinstance(to, Collection) will incorrectly match strings since strings are collections in Python. This could cause the code to iterate over individual characters instead of treating the string as an invalid input. Add an explicit check to exclude strings: if isinstance(to, Collection) and not isinstance(to, (str, bytes)):

Suggested change

	if isinstance(to, Collection):
	if isinstance(to, Collection) and not isinstance(to, (str, bytes)):