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wire 2026-08-25
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PYDANTIC FIXES SERIALIZER EXCLUSION BUG

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

Victorien
1 person shipped this
Victorien @Viicos 4 cited

Pydantic's most requested validation fix just landed, and it's exactly what your custom serializers have been waiting for.

Pydantic shipped a critical fix [1] that stops include/exclude filters from being silently dropped when a custom serializer isn't invoked, resolving issue #13601 and making output filtering predictable again. The same author also pushed support for `populate_by_name` in `@validate_call` [2], closing issue #13687 and bringing decorator behavior in line with model config. Forward references get extra test coverage [3] to lock down resolution edge cases from issue #13681, and a new docs publish CI [4] should keep the documentation pipeline green. With 7 commits and 7 PRs across the repo, this is a focused day of hardening. Test the serializer fix against your field-exclusion logic before your next release.

$ ls fastapi/reviews/ # the step-back reads

the week in review Pydantic drops Python 3.10, then layers serialization fast paths the month in review Five Pydantic validation bypasses and a quadratic URL check
Full archive → Weekly reviews →

Quick answers

What shipped in FastAPI & Pydantic on August 25, 2026?
Pydantic's most requested validation fix just landed, and it's exactly what your custom serializers have been waiting for. In total, 7 commits and 7 pull requests landed.
Who contributed to FastAPI & Pydantic on August 25, 2026?
1 developer shipped this update, including Victorien.
What were the notable FastAPI & Pydantic updates?
Do not drop include/exclude if serializer wasn't called (#13702), Support `populate_by_name` in `@validate_call`, and Add additional tests for forward references resolving.
♥

$ log FastAPI & Pydantic --recent

Pydantic fixes GC tracking in pydantic-core and caches UTC TzInfo 50 shipped Pydantic drops Python 3.10, accepts list and DecimalTuple for Decimal 37 shipped Pydantic reworks `TypeAdapter` call arguments, tightens `Decimal` schemas 13 shipped FastAPI bumps pillow and dnspython, Pydantic corrects arguments JSON Schema 6 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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