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Fix generated Python package long-path installs - #216
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Selectively shorten Python module paths with UTF-16, namespace, bytecode and atomic-write headroom. Compact layout-scoped setuptools build and wheel staging directories. Record the complete producer version and reject incompatible or unstamped generated output before mutation, preserving same-version incremental generation. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 2016e084-e482-4076-abde-eb8c13baf510
Mixed-language test coverageWorkflow status: ✅ Passed
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Migrate formatter interfaces, nested struct helpers and delegate constants away from long implementation filenames. Preserve all scenario assertions and verify the complete 56-case Python E2E matrix against the compact layout. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 2016e084-e482-4076-abde-eb8c13baf510
Replace deprecated build-base/bdist-dir options with build_base/bdist_dir while retaining compact hash-scoped paths. Update renderer assertions and packaging E2E cache checks; verify both deprecation warnings are gone and source/wheel installation still passes. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 2016e084-e482-4076-abde-eb8c13baf510
Kai Tao (vanzue)
approved these changes
Oct 9, 2026
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Generated Python packages can fail source or wheel installation on Windows with long paths disabled even when their generated source paths fit the legacy limit.
generator_version, including preview suffixes. Reject mismatched, downgraded, unstamped legacy, or corrupt producer metadata before changing existing output; require manual cleanup and full regeneration. Same-version incremental generation remains supported.Public type names, namespace APIs, and ordinary short entrypoints remain compatible. Direct imports of shortened long modules must migrate; no long-filename shims or automatic migration are added. Arbitrary checkout, package-name, or venv depths are not guaranteed.
Regression coverage includes real source/wheel installs with long paths disabled, installed imports and Windows calls, strict stub and inline consumers, optimized bytecode,
--no-pyi, Unicode output roots, version refusal/rollback, and incremental-versus-fresh parity.