Who contributed to .NET on August 1, 2026?

6 developers shipped this update, including charlesroddie, brianrourkeboll, PureWeen, vs-mobiletools-engineering-service2, jonathanpeppers, and Reuben Bond.

What were the notable .NET updates?

Implement interpolated strings via String.Concat, Record spreads: `{ ...expr }`, `{ ...ty }`, and fix(serialization)!: enforce type allow-list in default JSON storage serializer (#10268).

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The Wire · Showcase

F# INTERPOLATED STRINGS GO NATIVEAOT, ORLEANS HARDENS SECURITY

By RepoJournal · Filed 07:00 UTC on August 1, 2026 · About .NET

6 people shipped this

Reuben Bond @ReubenBond 4 cited

charlesroddie @charlesroddie 1 cited

brianrourkeboll @brianrourkeboll 1 cited

PureWeen @PureWeen 1 cited

jonathanpeppers @jonathanpeppers 1 cited

vs-mobiletools-engineering-service2 @vs-mobiletools-engineering-service2

F# ships String.Concat optimization for interpolated strings that cuts reflection overhead and unlocks NativeAOT compatibility, while Orleans enforces type allow-lists to close a deserialization vulnerability.

The F# team landed a major performance win for interpolated strings by switching to String.Concat where possible, eliminating reflection and making code trimmable for NativeAOT targets [1]. This ships alongside record spreads, a language feature that lets you build new records by spreading existing ones: `{ ...r1; ...r2; E = 5 }` [2]. Over in Orleans, a breaking change enforces type allow-lists in the default JSON storage serializer to block unsafe deserialization attacks [3], paired with nullable reference type rollout across the codebase [4]. The reminders subsystem saw optimization work that defers loading distant schedules until they enter a configurable window, cutting unnecessary work [5]. On the platform side, .NET Android now applies `runtimeconfig.dev.json` files to CoreCLR debug builds, enabling Hot Reload feature switches [6], and MAUI automated inter-branch forward merges to keep release branches in sync [7]. Orleans also landed a three-silo rolling upgrade test with sustained traffic to verify distributed directory handoff works end-to-end [8].

Action items

→ Review Orleans serialization changes if you store grain state in JSON - the type allow-list is breaking dotnet/orleans [immediate]
→ Test F# interpolated string codegen in your NativeAOT deployments once this ships dotnet/fsharp [plan]
→ Monitor Orleans rolling upgrade tests in your cluster staging environment dotnet/orleans [monitor]

References

[1] Implement interpolated strings via String.Concat ↗ dotnet/fsharp
[2] Record spreads: `{ ...expr }`, `{ ...ty }` ↗ dotnet/fsharp
[3] fix(serialization)!: enforce type allow-list in default JSON storage serializer (#10268) dotnet/orleans
[4] refactor: enable nullable reference types across Orleans (#10291) dotnet/orleans
[5] perf(reminders): drop reminders that are not due soon (#10259) dotnet/orleans
[6] Apply `*.runtimeconfig.dev.json` to CoreCLR apps ↗ dotnet/android
[7] Auto-merge clean inter-branch forward merges ↗ dotnet/maui
[8] fix(directory): support rolling upgrades to distributed directory (#10309) dotnet/orleans

Quick answers

What shipped in .NET on August 1, 2026?: F# ships String.Concat optimization for interpolated strings that cuts reflection overhead and unlocks NativeAOT compatibility, while Orleans enforces type allow-lists to close a deserialization vulnerability. In total, 21 commits and 22 pull requests landed.
Who contributed to .NET on August 1, 2026?: 6 developers shipped this update, including charlesroddie, brianrourkeboll, PureWeen, vs-mobiletools-engineering-service2, jonathanpeppers, and Reuben Bond.
What were the notable .NET updates?: Implement interpolated strings via String.Concat, Record spreads: `{ ...expr }`, `{ ...ty }`, and fix(serialization)!: enforce type allow-list in default JSON storage serializer (#10268).

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