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A claude -p run on Opus with an API key gives up after three consecutive 529s, about 1.5 seconds of backoff, no matter what CLAUDE_CODE_MAX_RETRIES says. Add --fallback-model, set CLAUDE_CODE_RETRY_WATCHDOG=1 with a max wait, or widen the 529 backoff with the OVERLOADED_RETRY delay variables. Checked against Claude Code 2.1.309.

Replace the deprecated Color.withOpacity, opacity, value, red, green, blue and alpha with withValues, .a/.r/.g/.b and toARGB32. What dart fix rewrites for you, the four getters it leaves behind, why exact color assertions and Map<Color, T> lookups break after the swap, and how withOpacity silently drops Display P3. Measured on Flutter 3.44.8 with Dart 3.12.2.

Rename MaterialState, MaterialStateProperty, MaterialStateColor and the rest of the family to their WidgetState equivalents. What dart fix rewrites, the input border subclasses it cannot touch, why a fromMap with & or | keys cannot be const, and how fromMap throws where resolveWith quietly fell back. Measured on Flutter 3.44.8 with Dart 3.12.2.

Replace hand-rolled WidgetsBindingObserver lifecycle code with AppLifecycleListener: the callback mapping, the state machine it enforces, the new hidden state that breaks exhaustive switches, desktop exit requests, and the test that suddenly asserts. Tested on Flutter 3.44.8 with Dart 3.12.2.

Microsoft.Playwright 1.64 adds Locator.Within() so you can write 'this button, within that dialog'. A quick probe shows it builds exactly the same locator as parent.Locator(child), including per-parent Nth() resolution.

Use Expanded when a child must fill its share of a Row or Column, and Flexible when it may be smaller than its share. Measured layouts on Flutter 3.44 show where the leftover space goes, why loose children never donate it to siblings, and when only Flexible survives unbounded constraints.

Claude Code 2.1.289 and earlier resend every screenshot on every turn, so one refused request means every later turn is refused too. Update to 2.1.290+ and resume with claude --continue; the client then trims the oldest images to 510, 255, then 127. On an old build, /compact or /clear. Then stop the screenshots piling up.

Use Lazy<T> by default: it runs the factory once, caches exceptions, and its reads are too cheap to measure after initialization. Use LazyInitializer.EnsureInitialized when you lazily fill many fields or array slots and cannot afford an extra object per value. Hand-written double-checked locking is almost never worth it on .NET 10.

.NET MAUI 10.0.120 turns on AllowDrop for the Windows BlazorWebView and registers AndroidX DropDataContentProvider on Android, so Blazor Hybrid drop zones work without platform code. Here is what changed, the new MauiEnableAndroidWebViewDragDrop switch, and the MAUI1002 warning.

unawaited_futures only looks inside async bodies, discarded_futures only inside sync bodies, and both miss arrow functions, tear-offs, and collection literals. Measured case by case on Dart 3.12.2 and Flutter 3.44.8, with the analysis_options.yaml I recommend.