See Changelog.

Thank you to pydantic's sponsors: @timdrijvers, @BCarley, @chdsbd, @tiangolo, @matin, @linusg, @kevinalh, @jorgecarleitao, @koxudaxi, @primer-api, @mkeen, @meadsteve for their kind support.

• fix: set right default value for required (optional) fields, #2142 by @PrettyWood
• fix: support underscore_attrs_are_private with generic models, #2138 by @PrettyWood
• fix: update all modified field values in root_validator when validate_assignment is on, #2116 by @PrettyWood
• Allow pickling of pydantic.dataclasses.dataclass dynamically created from a built-in dataclasses.dataclass, #2111 by @aimestereo
• Fix a regression where Enum fields would not propagate keyword arguments to the schema, #2109 by @bm424
• Ignore __doc__ as private attribute when Config.underscore_attrs_are_private is set, #2090 by @PrettyWood