Add polyfills for System.Collections.Generic.CollectionExtensions#113

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Tyrrrz merged 14 commits intoprimefrom

copilot/add-polyfills-for-collectionextensions

Apr 17, 2026

Commits on Apr 17, 2026

Add CollectionExtensions polyfills (TryAdd, Remove, AsReadOnly, ReadOnlySet, AddRange, InsertRange, CopyTo)

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Optimize InsertRange to use List.InsertRange(IEnumerable) for O(n) complexity

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Fix CS0592: remove ExcludeFromCodeCoverage from IReadOnlySet interface

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Move IsSubsetOf/IsSupersetOf assertions into first test

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Update CollectionExtensionsTests.cs
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Update CollectionExtensionsTests.cs
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Update CollectionExtensions.cs
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Move AsReadOnly IList/IDictionary polyfills from Net50 to Net70

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Use act.Should().Throw() and explicit cast var patterns in tests

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Use var with explicit cast pattern in all collection extension tests

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Use var with explicit cast for ReadOnlySpan declarations in Net80 tests

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Remove unnecessary IList/IDictionary bridge extensions from Net100/CollectionExtensions.cs

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Use nested #if for NETFRAMEWORK guards; use target-typed new in arrow-bodied extension methods

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Merge branch 'prime' into copilot/add-polyfills-for-collectionextensions
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