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wire 2026-09-17
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Pydantic docs examples stop passing silently, debug Python target lands in CI

By RepoJournal · Filed · About FastAPI & Pydantic · Composed from the cited sources · methodology

1 person shipped this

A quiet day in pydantic: documentation examples that were never actually raising now fail correctly, an unused error code is gone, and CI gains a debug Python test target.

Fix documentation examples not raising and remove unused `string_sub_type` unused error code pydantic/pydantic

by Viicos

Documentation examples that should have raised were not raising at all, so they passed regardless of what the library did; the examples now assert correctly, and the unused `string_sub_type` error code is removed. The root cause is upstream in pytest-examples, tracked in pydantic/pytest-examples, with the pydantic-side issue fixed by this change.

Add a debug Python test target in CI (#13820) pydantic/pydantic

by Victorien

A debug Python test target now runs in pydantic CI, the follow-up to the issue tracked in pydantic/pydantic. It exists so the test suite can be exercised against a debug build of the interpreter rather than only release CPython.

Add regression test for union member strictness on an enum type (#13815) pydantic/pydantic

by Louis Deconinck

A regression test pins the expected behavior for strictness of union members when one member is an enum type, so a future change to union validation fails loudly instead of quietly.

Add a debug Python test target in CI pydantic/pydantic

by Viicos

The same debug test target arrives as a pull request in pydantic/pydantic, opening the discussion on the approach before it lands.

Fix documentation examples not raising and remove unused `string_sub_type` unused error code (#13821) pydantic/pydantic

by Victorien

The commit carrying the documentation fix and the `string_sub_type` removal is merged to main, so the corrected examples and the smaller error-code surface are available to anyone tracking the default branch.

Quick answers

What shipped in FastAPI & Pydantic on September 17, 2026?
A quiet day in pydantic: documentation examples that were never actually raising now fail correctly, an unused error code is gone, and CI gains a debug Python test target. In total, 3 commits and 3 pull requests landed.
Who contributed to FastAPI & Pydantic on September 17, 2026?
1 developer shipped this update, including Victorien.
What were the notable FastAPI & Pydantic updates?
Fix documentation examples not raising and remove unused `string_sub_type` unused error code, Add a debug Python test target in CI (#13820), and Add regression test for union member strictness on an enum type (#13815).