Who contributed to .NET on July 30, 2026?

10 developers shipped this update, including Rolf Bjarne Kvinge, copilot-swe-agent, Copilot, Pranav Senthilnathan, tannergooding, Rachel Jarvi, EgorBo, and jonathanpeppers, and 2 more.

What were the notable .NET updates?

[msbuild] Strip framework metadata by default. Fixes #15724 (#26253), [msbuild] Return full paths from FilterStaticFrameworks. Fixes #19602 (#26244), and [dotnet-linker] Skip inlining Dlfcn in reloadable assemblies. Fixes #26075.

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The Wire · Showcase

MACIOS STRIPS FRAMEWORK BLOAT, RUNTIME HARDENS SIMD TYPE CHECKING

By RepoJournal · Filed 07:01 UTC on July 30, 2026 · About .NET

10 people shipped this

Rolf Bjarne Kvinge @rolfbjarne 3 cited

tannergooding @tannergooding 1 cited

EgorBo @EgorBo 1 cited

jonathanpeppers @jonathanpeppers 1 cited

Adam Boniecki @abonie 1 cited

copilot-swe-agent @copilot-swe-agent

Copilot @Copilot

Pranav Senthilnathan @PranavSenthilnathan

Rachel Jarvi @rcj1

csigs @csigs

Apple binding builds get leaner with automatic framework header stripping, while the runtime tightens SIMD intrinsic validation to prevent misclassification of new non-SIMD types.

The macios team landed three high-impact msbuild changes that reduce app bundle size and build overhead. Framework metadata stripping now runs by default, removing Headers, PrivateHeaders, and Modules directories before code signing with a StripFrameworkHeaders=false escape hatch [1]. A separate fix eliminates a redundant remote round trip during framework filtering by resolving identities upfront in FilterStaticFrameworks [2]. Hot Reload compatibility got explicit protection too: the dotnet-linker now gates Dlfcn inlining on a HotReloadCompatibleBuild property so reloadable assemblies stay unmolested [3]. Over in runtime, a follow-up to SIMD intrinsic handling switched from a deny-all approach (carving out decimal types) to an explicit allow list in getTypeLayout, preventing future non-SIMD intrinsics from being misrouted as opaque SIMD nodes [4]. MemoryCache contention got hammered: a single fix drove win-arm64 performance up 6x on a 1P workload [5]. Android's dotnet run now handles instrumentation-only apps without activities, opening the door to BenchmarkDotNet hosts and headless on-device harnesses [6]. F# official builds are whole again after Arcade 11 ripped out the SDL post-build scripts; PoliCheck exclusions migrated to the 1ES sdl: block [7].

Action items

→ Review StripFrameworkHeaders default in your macios builds; set to false only if your app relies on bundled framework headers dotnet/macios [plan]
→ Test instrumentation-only Android apps with dotnet run if you ship on-device benchmarks or test harnesses dotnet/android [monitor]
→ Verify F# official build pipelines completed successfully post-Arcade 11; confirm SDL validation in 1ES templates dotnet/fsharp [immediate]

References

[1] [msbuild] Strip framework metadata by default. Fixes #15724 (#26253) dotnet/macios
[2] [msbuild] Return full paths from FilterStaticFrameworks. Fixes #19602 (#26244) dotnet/macios
[3] [dotnet-linker] Skip inlining Dlfcn in reloadable assemblies. Fixes #26075 ↗ dotnet/macios
[4] Use an explicit allow list for SIMD types in getTypeLayout ↗ dotnet/runtime
[5] Improve MemoryCache performance under high contention ↗ dotnet/runtime
[6] [Xamarin.Android.Build.Tasks] instrumentation-only apps + `dotnet run` ↗ dotnet/android
[7] Move SDL/TSA validation to 1ES templates after Arcade 11 upgrade (#20096) dotnet/fsharp

Quick answers

What shipped in .NET on July 30, 2026?: Apple binding builds get leaner with automatic framework header stripping, while the runtime tightens SIMD intrinsic validation to prevent misclassification of new non-SIMD types. In total, 50 commits and 51 pull requests landed.
Who contributed to .NET on July 30, 2026?: 10 developers shipped this update, including Rolf Bjarne Kvinge, copilot-swe-agent, Copilot, Pranav Senthilnathan, tannergooding, Rachel Jarvi, EgorBo, and jonathanpeppers, and 2 more.
What were the notable .NET updates?: [msbuild] Strip framework metadata by default. Fixes #15724 (#26253), [msbuild] Return full paths from FilterStaticFrameworks. Fixes #19602 (#26244), and [dotnet-linker] Skip inlining Dlfcn in reloadable assemblies. Fixes #26075.

DOTNET FOUNDATION PULLS iOS METRICS INTO FOCUS AS RUNTIME HARDENS HTTP PARSING

Performance team fixed iOS size reporting to measure only distributable packages, while runtime clamped down on RFC 9112 compliance for chunked encoding.

dotnet 72 shipped

@dotnet Aug 5

HELIX MACHINE CORRUPTION DETECTION ROLLS OUT; RUNTIME MUTUAL AUTH TIGHTENS

Performance's new dpkg detection takes broken test machines offline automatically, while runtime enforces Negotiate mutual authentication and SDK extends binary log sessions across device builds.

dotnet 133 shipped

@dotnet Aug 4

RUNTIME STRIPS DEAD CODE, FIXES TRIMMER DATAFLOW BUGS ACROSS CODEPATH

CoreCLR interop stubs lose obsolete target tagging while trimmer gains null-safety guards in generic-attribute processing, unblocking three years of accumulated simplification work.

dotnet 84 shipped

@dotnet Aug 3

ROSLYN FIXES EDITOR SYNC, WPF TIGHTENS SECURITY

Roslyn patched a critical textDocument notification handler that was dropping range information, breaking editor sync across the IDE.

dotnet 8 shipped

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