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Microsoft.AspNetCore.OpenApi only marks a response nullable when the action returns a bare T?

On container protocol 2.0.0, Foundry hosted agents isolate conversations and sessions per Entra caller by default.

A single-subscription stream accepts exactly one listen() for its whole life.

OpenTelemetry .NET 1.20.0, released on October 15, 2026, adds TracerProviderBuilder.ConfigureSampler.

Android kills backgrounded Flutter apps to reclaim memory, and when the user comes back every StatefulWidget starts from scratch.

AnimatedSwitcher only transitions when Widget.canUpdate says the new child is a different widget, so Text to Text with no key just updates in place.

Since Claude Code v2.1.295, a command or HTTP hook can set onFailure to "block" so a guard that crashes, times out, cannot start or prints invalid JSON stops the tool call instead of waving it through.

Subclass ThemeExtension, register one instance per ThemeData through the extensions list, read it with Theme.of(context).extension(), and write a real lerp so MaterialApp's AnimatedTheme interpolates your tokens during a light/dark switch.

Refit 16.4.0 adds an opt-in HttpRetryHandler that retries idempotent requests, honors Retry-After and provider-specific headers like x-ratelimit-reset and x-ms-retry-after-ms, and needs no Polly or resilience package.

A broadcast StreamController drops every event that fired before you subscribed.

Claude Code v2.1.296 lets a subagent auto-compact earlier than the main conversation.

Use the en-IN culture or set NumberFormatInfo.NumberGroupSizes to [3, 2] to print 12,34,56,789 instead of 123,456,789 in C#.

FlutterError.onError only sees errors thrown inside framework callbacks.

MapIdentityApi() maps ten endpoints and has no switch to skip one.

A with expression calls the record's compiler-generated $ method, which runs a copy constructor that copies every instance field and skips all initializers.

The EF Core version of the SQL Server provider in your startup project decides it: EF Core 7 and earlier scaffold date as DateTime, EF Core 8 through 11 scaffold it as DateOnly.

Wire Cursor Rollouts (launched September 23, 2026) to your CI and to Datadog so every PR, including the ones a cloud agent wrote, gets a rollout plan before merge and per-environment checks at deploy, 20 minutes, 1 hour, 1 day and 3 days.

Microsoft.Extensions.Telemetry 10.11.0, released October 15, 2026, adds an experimental IncludeScopes option to global and per-request log buffering, so OrderId and TenantId from BeginScope survive a Flush() instead of being silently dropped.

ref-safe-context is the scope in which a reference to a variable stays valid.

A practical setup for Cursor Projects: prepare the repo so every worker starts warm, seed the Project's shared Context with a plan, conventions and a slice ledger, cut the work into disjoint PR-sized slices, and let subscriptions keep it moving.

Upgrading a Blazor Web App whose pages live in a Razor class library or a .Client project from .NET 8 to .NET 10: what stays the same (both AdditionalAssemblies registrations), and the four things that break, from a 404 on blazor.web.js in thin hosts to N…

A one-time, crash-safe import of existing Hive boxes into a drift SQLite database on the user's device: schema design, the import function, idempotency, deleting the boxes, and the two gotchas that silently corrupt data (DateTime precision and class-name…

dotnetup went to public preview on October 15, 2026.

Use await Task.Delay for any timed wait in async code, Thread.Sleep only on a dedicated thread you own, and SpinWait only for sub-microsecond waits inside lock-free code.

Request a GitHub Copilot code review from a script with the REST requested_reviewers endpoint, the GraphQL requestReviewsByLogin mutation, or gh pr edit, then control whether it runs at Lite or Balanced effort.

On an SMB or NFS share, polling is the source of truth and FileSystemWatcher is at best a hint.

System.Formats.Cbor 11.0.0-rc.2 adds isFinalBlock, NeedsMoreData, and SlideData to CborReader, so you can decode CBOR straight off a stream without buffering the whole document.

Send GitHub Copilot app agent traces, token metrics and events to your own OTLP collector with the telemetry block in enterprise managed settings.

The Flutter SDK pins versions of meta, vector_math, test_api and matcher, so every SDK change re-resolves your lockfile, and flutter upgrade runs pub upgrade on the project you stand in.

Pomelo 9.0.0 only allows EF Core Relational 9.0.x and has no EF Core 10 build.

FileInfo caches its size, enumeration reads NTFS's lazily updated directory entry, and the writer may still hold bytes in its own buffers.

Azure MCP Server 3.0.0 shipped on October 12, 2026.

Enable GitHub Copilot local sandboxing in Copilot CLI 1.0.95 and the Copilot app, then lock down filesystem paths, outbound hosts, git/gh tokens and masked environment variables.

Drain the console input buffer with while (Console.KeyAvailable) Console.ReadKey(true) before you wait for a fresh key, and drain it every frame in a game loop so key repeat cannot pile up.

FluentValidation 12.2.0, released October 10, 2026, swaps Enum.GetValues for Enum.GetValuesAsUnderlyingType inside EnumValidator, so IsInEnum() on a [Flags] enum no longer throws NotSupportedException in a native AOT binary.

The tool package targets a newer .NET than the SDK running the install, or it is not a .NET tool at all.

A provisioning profile passed to xcodebuild on the command line applies to every SwiftPM resource bundle target.

Quartz.NET 4.4.0 lets a job set context.Result to a JobRunReport (Succeeded, Failed, Cancelled or Skipped, with a summary and metrics), keeps that per job in the execution history, and adds RequireSuccessWithin health checks that degrade when a nightly job

Open the log with FileShare.ReadWrite | FileShare.Delete, seek to the end, poll for new bytes, decode them with your own UTF-8 Decoder instead of StreamReader, and handle truncation and rotation explicitly.

Drive NavigationBar.selectedIndex from StatefulNavigationShell.currentIndex, never from a setState field or a copy made in initState.

Write a Copilot dynamic workflow with defineWorkflow in .github/extensions//extension.mjs, then run it headless with copilot workflow run in GitHub Actions.

Use DbSet.Local.FindEntry(key) to ask the change tracker whether an entity with a given key is tracked, without a database round trip or a scan.

A transparent struct is one the ABI treats exactly like its only field. .NET 11 has no such guarantee: a struct wrapping a double is passed in RCX on Windows x64 but in XMM0 on Linux and macOS.

Magentic orchestration is Agent Framework's port of AutoGen's Magentic-One: an LLM manager writes a fact sheet and plan (the task ledger), then grades every round with a JSON progress ledger to pick the next agent, detect stalls and replan.

A build mode (debug, profile, release) decides how Flutter compiles your Dart code.

A compiled model is generated C# that recreates your EF Core model without running OnModelCreating.

Balancing groups (?)

Genkit Dart 1.0.0 freezes the API, moves HTTP serving into core with GenkitRouter, and changes the streamed error frame.

A shadow property is a column EF Core tracks without a matching CLR property.

The GitHub Copilot SDK (1.0.18, October 8, 2026) is a thin client for the Copilot CLI runtime: your app speaks JSON-RPC to the same agent loop that powers Copilot CLI, with built-in file and shell tools, MCP, sub-agents, hooks, and BYOK.