What's Changed

Packaging

• Bump ruff to v0.5.0 and pyright to v1.1.369 by @sydney-runkle in #9801
• Bump pydantic-extra-types to v2.9.0 by @sydney-runkle in #9832
• Support compatibility with pdm v2.18.1 by @Viicos in #10138
• Bump pydantic-core to v2.23.0 by @sydney-runkle in #10180
• Bump v1 version stub to v1.10.18 by @sydney-runkle in #10214

New Features

• Add support for ZoneInfo by @Youssefares in #9896
• Add Config.val_json_bytes by @josh-newman in #9770
• Add DSN for Snowflake by @aditkumar72 in #10128
• Support complex number by @changhc in #9654
• Add support for annotated_types.Not by @aditkumar72 in #10210
• Allow WithJsonSchema to inject $refs w/ http or https links by @dAIsySHEng1 in #9863
• Allow validators to customize validation JSON schema by @Viicos in #10094
• Support parametrized PathLike types by @nix010 in #9764
• Add tagged union serializer that attempts to use str or callable discriminators to select the correct serializer by @sydney-runkle in in pydantic/pydantic-core#1397

Changes

• Breaking Change: Merge dict type json_schema_extra by @sydney-runkle in #9792
  • For more info (how to replicate old behavior) on this change, see here
• Refactor annotation injection for known (often generic) types by @sydney-runkle in #9979
• Move annotation compatibility errors to validation phase by @sydney-runkle in #9999
• Improve runtime errors for string constraints like pattern for incompatible types by @sydney-runkle in #10158
• Remove 'allOf' JSON schema workarounds by @dpeachey in #10029
• Remove typed_dict_cls data from CoreMetadata by @sydney-runkle in #10180
• Deprecate passing a dict to the Examples class by @Viicos in #10181
• Remove initial_metadata from internal metadata construct by @sydney-runkle in #10194
• Use re.Pattern.search instead of re.Pattern.match for consistency with rust behavior by @tinez in pydantic/pydantic-core#1368
• Show value of wrongly typed data in pydantic-core serialization warning by @BoxyUwU in pydantic/pydantic-core#1377
• Breaking Change: in pydantic-core, change metadata type hint in core schemas from Any -> Dict[str, Any] | None by @sydney-runkle in pydantic/pydantic-core#1411

Performance

• Initial start at improving import times for modules, using caching primarily by @sydney-runkle in #10009
• Using cached internal import for BaseModel by @sydney-runkle in #10013
• Simplify internal generics logic - remove generator overhead by @sydney-runkle in #10059
• Remove default module globals from types namespace by @sydney-runkle in #10123
• Performance boost: skip caching parent namespaces in most cases by @sydney-runkle in #10113

Minor Internal Improvements

• ⚡️ Speed up multiple_of_validator() by 31% in pydantic/_internal/_validators.py by @misrasaurabh1 in #9839
• ⚡️ Speed up ModelPrivateAttr.__set_name__() by 18% in pydantic/fields.py by @misrasaurabh1 in #9841
• ⚡️ Speed up dataclass() by 7% in pydantic/dataclasses.py by @misrasaurabh1 in #9843
• ⚡️ Speed up function _field_name_for_signature by 37% in pydantic/_internal/_signature.py by @misrasaurabh1 in #9951
• ⚡️ Speed up method GenerateSchema._unpack_refs_defs by 26% in pydantic/_internal/_generate_schema.py by @misrasaurabh1 in #9949
• ⚡️ Speed up function apply_each_item_validators by 100% in pydantic/_internal/_generate_schema.py by @misrasaurabh1 in #9950
• ⚡️ Speed up method ConfigWrapper.core_config by 28% in pydantic/_internal/_config.py by @misrasaurabh1 in #9953

Fixes

• Respect use_enum_values on Literal types by @kwint in #9787
• Prevent type error for exotic BaseModel/RootModel inheritance by @dmontagu in #9913
• Fix typing issue with field_validator-decorated methods by @dmontagu in #9914
• Replace str type annotation with Any in validator factories in documentation on validators by @maximilianfellhuber in #9885
• Fix ComputedFieldInfo.wrapped_property pointer when a property setter is assigned by @tlambert03 in #9892
• Fix recursive typing of main.IncEnx by @tlambert03 in #9924
• Allow usage of type[Annotated[...]] by @Viicos in #9932
• mypy plugin: handle frozen fields on a per-field basis by @dmontagu in #9935
• Fix typo in invalid-annotated-type error code by @sydney-runkle in #9948
• Simplify schema generation for uuid, url, and ip types by @sydney-runkle in #9975
• Move date schemas to _generate_schema.py by @sydney-runkle in #9976
• Move decimal.Decimal validation to _generate_schema.py by @sydney-runkle in #9977
• Simplify IP address schema in _std_types_schema.py by @sydney-runkle in #9959
• Fix type annotations for some potentially generic GenerateSchema.match_type options by @sydney-runkle in #9961
• Add class name to "has conflict" warnings by @msabramo in #9964
• Fix dataclass ignoring default_factory passed in Annotated by @kc0506 in #9971
• Fix Sequence ignoring discriminator by @kc0506 in #9980
• Fix typing for IPvAnyAddress and IPvAnyInterface by @haoyun in #9990
• Fix false positives on v1 models in mypy plugin for from_orm check requiring from_attributes=True config by @radekwlsk in #9938
• Apply strict=True to __init__ in mypy plugin by @kc0506 in #9998
• Refactor application of deque annotations by @sydney-runkle in #10018
• Raise a better user error when failing to evaluate a forward reference by @Viicos in #10030
• Fix evaluation of __pydantic_extra__ annotation in specific circumstances by @Viicos in #10070
• Fix frozen enforcement for dataclasses by @sydney-runkle in #10066
• Remove logic to handle unused __get_pydantic_core_schema__ signature by @Viicos in #10075
• Use is_annotated consistently by @Viicos in #10095
• Fix PydanticDeprecatedSince26 typo by @kc0506 in #10101
• Improve pyright tests, refactor model decorators signatures by @Viicos in #10092
• Fix ip serialization logic by @sydney-runkle in #10112
• Warn when frozen defined twice for dataclasses by @mochi22 in #10082
• Do not compute JSON Schema default when plain serializers are used with when_used set to 'json-unless-none' and the default value is None by @Viicos in #10121
• Fix ImportString special cases by @sydney-runkle in #10137
• Blacklist default globals to support exotic user code with __ prefixed annotations by @sydney-runkle in #10136
• Handle nullable schemas with serialization schema available during JSON Schema generation by @Viicos in #10132
• Reorganize BaseModel annotations by @kc0506 in #10110
• Fix core schema simplification when serialization schemas are involved in specific scenarios by @Viicos in #10155
• Add support for stringified annotations when using PrivateAttr with Annotated by @Viicos in #10157
• Fix JSON Schema number type for literal and enum schemas by @Viicos in #10172
• Fix JSON Schema generation of fields with plain validators in serialization mode by @Viicos in #10167
• Fix invalid JSON Schemas being generated for functions in certain scenarios by @Viicos in #10188
• Make sure generated JSON Schemas are valid in tests by @Viicos in #10182
• Fix key error with custom serializer by @sydney-runkle in #10200
• Add 'wss' for allowed schemes in NatsDsn by @swelborn in #10224
• Fix Mapping and MutableMapping annotations to use mapping schema instead of dict schema by @sydney-runkle in #10020
• Fix JSON Schema generation for constrained dates by @Viicos in #10185
• Fix discriminated union bug regression when using enums by @kfreezen in pydantic/pydantic-core#1286
• Fix field_serializer with computed field when using * by @nix010 in pydantic/pydantic-core#1349
• Try each option in Union serializer before inference by @sydney-runkle in pydantic/pydantic-core#1398
• Fix float serialization behavior in strict mode by @sydney-runkle in pydantic/pydantic-core#1400
• Introduce exactness into Decimal validation logic to improve union validation behavior by @sydney-runkle in in pydantic/pydantic-core#1405

New Contributors

pydantic

• @kwint made their first contribution in #9787
• @seekinginfiniteloop made their first contribution in #9822
• @a-alexander made their first contribution in #9848
• @maximilianfellhuber made their first contribution in #9885
• @karmaBonfire made their first contribution in #9945
• @s-rigaud made their first contribution in #9958
• @msabramo made their first contribution in #9964
• @DimaCybr made their first contribution in #9972
• @kc0506 made their first contribution in #9971
• @haoyun made their first contribution in #9990
• @radekwlsk made their first contribution in #9938
• @dpeachey made their first contribution in #10029
• @BoxyUwU made their first contribution in #10085
• @mochi22 made their first contribution in #10082
• @aditkumar72 made their first contribution in #10128
• @changhc made their first contribution in #9654
• @insumanth made their first contribution in #10229

pydantic-core

• @kfreezen made their first contribution in pydantic/pydantic-core#1286
• @tinez made their first contribution in pydantic/pydantic-core#1368
• @fft001 made their first contribution in pydantic/pydantic-core#1362
• @nix010 made their first contribution in pydantic/pydantic-core#1349
• @BoxyUwU made their first contribution in pydantic/pydantic-core#1379
• @candleindark made their first contribution in pydantic/pydantic-core#1404
• @changhc made their first contribution in pydantic/pydantic-core#1331

Full Changelog: https://github.com/pydantic/pydantic/compare/v2.8.1...v2.8.2