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wire 2026-08-13
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PYDANTIC FIXES GENERIC ALIAS CRASHES, SQLMODEL AND FASTAPI MIGRATE LABEL INFRASTRUCTURE

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

Viicos tiangolo latest-changes[bot]
3 people shipped this
Viicos @Viicos 5 cited tiangolo @tiangolo 4 cited latest-changes[bot] @latest-changes[bot]

Pydantic shipped fixes for unhashable generic aliases that were causing core schema generation to error [ref:8], while both FastAPI and SQLModel overhauled their release note automation.

The main signal today comes from the Pydantic desk, where Viicos landed a critical fix [1] that stops Pydantic from erroring on unhashable generic aliases during core schema generation, resolving a reported issue [1]. The same contributor also bumped Click to v8.4.2 [2] to close a dependency concern and worked around a circular import error in Mypy that was causing test failures [3]. Over on the FastAPI and SQLModel side, tiangolo completed infrastructure work across both repos, migrating automatic label generation to the Latest Changes system [4] [5] [6] [7]. This is housekeeping that improves maintainability for release tracking, though it doesn't change runtime behavior. The Pyodide lockfile also got a refresh [8] [9] to keep browser-based tooling current.

Action items

References

  1. [1] Do not error on unhashable generic aliases during core schema generation โ†— pydantic/pydantic
  2. [2] Bump `click` to v8.4.2 โ†— pydantic/pydantic
  3. [3] Workaround circular import error in Mypy โ†— pydantic/pydantic
  4. [4] ๐Ÿ‘ท Migrate automatic labels to Latest Changes โ†— fastapi/fastapi
  5. [5] ๐Ÿ‘ท Migrate automatic labels to Latest Changes (#16185) โ†— fastapi/fastapi
  6. [6] ๐Ÿ‘ท Migrate automatic labels to Latest Changes โ†— tiangolo/sqlmodel
  7. [7] ๐Ÿ‘ท Migrate automatic labels to Latest Changes (#2074) โ†— tiangolo/sqlmodel
  8. [8] Update Pyodide lockfile โ†— pydantic/pydantic
  9. [9] Update Pyodide lockfile (#13649) โ†— pydantic/pydantic

$ 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 August 13, 2026?
Pydantic shipped fixes for unhashable generic aliases that were causing core schema generation to error [ref:8], while both FastAPI and SQLModel overhauled their release note automation. In total, 8 commits and 6 pull requests landed.
Who contributed to FastAPI & Pydantic on August 13, 2026?
3 developers shipped this update, including tiangolo, latest-changes[bot], and Viicos.
What were the notable FastAPI & Pydantic updates?
Do not error on unhashable generic aliases during core schema generation, Bump `click` to v8.4.2, and Workaround circular import error in Mypy.
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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