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Release notes for 8.4.0 covering changes since 8.3.0 (February 26, 2026): - Bug fixes: GetEnumUnderlyingType, decodeILCustomAttribData byte-width, generative delegate types + GetInterface, thread-safety races, System.Type custom attribute decoding - Performance: member wrapper caching, FullName/BaseType/GetInterfaces caching - Refactor: ConcurrentDictionary simplification - CI: Actions v1→v4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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dsyme
approved these changes
Apr 1, 2026
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Summary
Release notes for version 8.4.0, covering all changes merged since 8.3.0 (February 26, 2026).
Changes included in 8.4.0
Bug fixes:
GetEnumUnderlyingType()now correctly handles non-Int32 enum underlying types ([Repo Assist] Fix GetEnumUnderlyingType for non-Int32 enums + tests for byte/int64 enums #470)decodeILCustomAttribDatareads correct byte-width for non-Int32 enum fixed args (ECMA-335) ([Repo Assist] Fix decodeILCustomAttribData: read correct byte-width for non-Int32 enum fixed args #475)GetInterfaceimplemented onProvidedTypeDefinitionandTargetTypeDefinition([Repo Assist] Fix generative delegate type support; implement GetInterface on ProvidedTypeDefinition #479)TargetTypeDefinitionmember-wrapper caches fixed ([Repo Assist] Fix thread-safety races in member-wrapper caches (issue #481) #482)Performance:
TargetTypeDefinitionto avoid repeated allocations ([Repo Assist] Perf: cache member wrapper objects in TargetTypeDefinition #471)FullName,BaseTypeandGetInterfaces()cached inTargetTypeDefinition([Repo Assist] Perf: cache FullName, BaseType and GetInterfaces in TargetTypeDefinition #485)Refactoring:
mkCacheInt32/mkCacheGenericsimplified to useConcurrentDictionary(Simplify mkCacheInt32/mkCacheGeneric to use ConcurrentDictionary #486)CI:
Test Status
✅ All 126 tests pass on the current master (
dotnet test tests/FSharp.TypeProviders.SDK.Tests.fsproj -c Release)Please bump the NuGet package version to 8.4.0 in the project file before merging if that step isn't automated.