Bump to 4.2.1: iOS ctypes .dylib simulator fix + _multiprocessing#224
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Re-pin python-build to release 20260701 and bump all packages to 4.2.1. - python-build 20260701 only rebuilds the iOS runtime (now builds the `_multiprocessing` extension, importable-not-spawnable); the manifest is otherwise identical to 20260630, so all Python/Pyodide/dart_bridge/ABI versions are unchanged and every non-iOS runtime is byte-for-byte the same. Regenerated python_versions.dart + the four python_versions.properties via `gen_version_tables --release-date 20260701`. - serious_python_darwin 4.2.1 ships the ctypes `.dylib` iOS-simulator fix (#223): plain `.dylib` shared libs are now framework-ized like `.so` C-extensions (with install-name preserved for multi-lib packages), so `.dylib`-shipping packages (e.g. llama-cpp-python) load on the simulator. - Bump version in all six pubspec.yaml, the Android build.gradle.kts, and the Darwin podspec; add CHANGELOG entries to every package. - Add a `prepare-release` Claude Code skill documenting this process.
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Summary
Re-pins python-build to release
20260701and bumps all six packages to 4.2.1.python-build
20260630→20260701The new release only rebuilds the iOS runtime, which now builds the
_multiprocessingextension (importable, not spawnable — flet-dev/python-build#27). The manifest is otherwise byte-identical to20260630, so all Python (3.12.13 / 3.13.14 / 3.14.6) / Pyodide /dart_bridge(1.4.1) / ABI versions are unchanged and every non-iOS runtime is byte-for-byte the same. Version tables were regenerated with:(only the release-date string moves in the generated files; verified idempotent against the CI drift check).
serious_python_darwin — ctypes
.dylibiOS-simulator fix (#223)Plain
.dylibshared libs are now framework-ized as per-slice xcframeworks like.soC-extensions (with the install-name preserved so multi-lib packages resolve their siblings), so.dylib-shipping ctypes packages (e.g.llama-cpp-python) load on the iOS simulator instead of failingdlopenwithincompatible platform (have 'iOS', need 'iOS-simulator'). The.sopath is unchanged.Version bump 4.2.0 → 4.2.1
version:in all sixsrc/*/pubspec.yamlversioninserious_python_android/android/build.gradle.ktss.versioninserious_python_darwin/darwin/serious_python_darwin.podspecAlso
prepare-releaseClaude Code skill (.claude/skills/prepare-release/SKILL.md) documenting this release process.