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Use ToLookup when you group once and only read: it is immutable, returns an empty sequence for missing keys, accepts null keys and keeps first-seen order. Use Dictionary<TKey, List<TValue>> when the groups change after construction or cross a JSON boundary.

The ASP.NET Core team mapped out where C# 15 union types flow through .NET 11: minimal API and MVC bodies, SignalR's JsonHubProtocol, Blazor, and OpenAPI anyOf schemas. Route, query, header, and form binding are not supported yet.

Flutter web 3.41 to 3.44 reports a ~625x line-height override when an Android WebView's textZoom is not 100. Upgrade to 3.47, or clear the override in MaterialApp.builder.

A reload only revalidates index.html, so an unhashed main.dart.js keeps coming from the browser cache. Send Cache-Control: no-cache for the Flutter build output, stamp a build id where you cannot set headers, and let the self-cleaning service worker retire pre-3.41 caches.

OAuth succeeded but every MCP call gets 401 invalid_token? Make the PRM resource, the token's aud and your validator agree on one canonical server URL.

Your app imports material_ui but google_fonts 8.2.1 still returns the SDK TextTheme. Build the TextTheme yourself from GoogleFonts.roboto tear-offs until google_fonts migrates.

The release APK shipped without libapp.so. Flutter 3.44.0 to 3.44.4 could drop it: upgrade to 3.44.5 or later and split the combined subprojects block.

Microsoft.Authentication.WebAssembly.Msal 10.0.8, 9.0.16 and 8.0.27 moved to msal.js 4, whose async init races itself. Initialize MSAL once in Program.cs, or pin 10.0.7.

EF Core's build-time model generation re-entered MSBuild until RAM ran out. Upgrade Tasks and Design to 10.0.10+, and on EF Core 11 delete EFOptimizeContext.

Use Cursor's /goal command to keep a cloud agent working toward one finish line across many turns. Covers writing a verifiable objective, pinning a Custom Mode playbook, pairing it with /loop and subscriptions, the CLI's durable goals, and how to stop a goal that ignores Stop.