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wire 2026-09-26
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Pydantic adds multiple_of for Fraction and timedelta

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

Viicos latest-changes[bot] agustin18
3 people shipped this
Viicos @Viicos 2 cited latest-changes[bot] @latest-changes[bot] 1 cited agustin18 @agustin18 1 cited

Pydantic extended its core schemas so two more types accept the multiple_of constraint, while FastAPI's feed carried release-notes housekeeping and nothing else.

Add support for `multiple_of` constraint in `fraction` and `timedelta` core schemas pydantic/pydantic

by Viicos

The fraction and timedelta core schemas now honor multiple_of, so validators that previously rejected the constraint for those types will accept it, closing the gap reported in the linked issue.

Add support for `multiple_of` constraint in `fraction` and `timedelta` core schemas (#13873) pydantic/pydantic

by Victorien

Same constraint work as it landed on the default branch, following Viicos's proposal to support multiple_of in the fraction and timedelta core schemas.

Remove local import in `resolve_default_value()` (#13871) pydantic/pydantic

by agustin18

agustin18 removed a local import inside resolve_default_value(), a small cleanup that trims per-call overhead in the default-resolution path.

๐Ÿ“ Update release notes fastapi/fastapi

by latest-changes[bot]

The latest-changes bot refreshed FastAPI's release notes in a commit tagged skip ci, so the published notes match what already shipped.

$ 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 โ†’ Weekly reviews โ†’

Quick answers

What shipped in FastAPI & Pydantic on September 26, 2026?
Pydantic extended its core schemas so two more types accept the multiple_of constraint, while FastAPI's feed carried release-notes housekeeping and nothing else. In total, 4 commits and 4 pull requests landed.
Who contributed to FastAPI & Pydantic on September 26, 2026?
3 developers shipped this update, including latest-changes[bot], Viicos, and agustin18.
What were the notable FastAPI & Pydantic updates?
Add support for `multiple_of` constraint in `fraction` and `timedelta` core schemas, Add support for `multiple_of` constraint in `fraction` and `timedelta` core schemas (#13873), and Remove local import in `resolve_default_value()` (#13871).
โ™ฅ

$ 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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