Features & fixes:

• Fix inclusion of py.typed in wheel.

Breaking changes:

• The type annotations now require mypy 1.0 or higher to validate correctly.

Features & fixes:

• Create values for fields of non-list or dict composite types (such as frozenset or OrderedDict) as that type, instead of list or dict.
• Allow overriding the field for specific composite types through the serializer_field_mapping dictionary.
• Don't set optional fields to rest_framework.fields.empty sentinel value when used in non-partial mode. This fixes occasional leaks of the sentinel into dataclasses returned to the user, for example when a DataclassSerializer was nested inside a regular serializer. Not setting, and later stripping, the sentinels also increases performance.
• Support dataclasses with fields that have init=False.
• Support save() on serializers with many=True.
• Support for fields with union types.
• Support nested serializers with source='*'.
• Fix child_kwargs defined in dataclass field metadata (as opposed to extra_kwargs field on Meta subclass).

• Allow all types, including special forms such as unions, to have their field type overridden through the serializer_field_mapping dictionary.
• Also treat unions containing None as optional if they consist of three or more members. Previously this was only the case for unions with two members (i.e. only unions of a type with None were optional).
• Many added and fixed type hints.

• Fix usage of PEP 585 generics with forward references (e.g. list["str"]).
• Fix usage of allow_empty with many=True.

Features & fixes:

• Allow using the new X | None union syntax for specifying optional fields in Python 3.10+ (PEP 604).

Features & fixes:

• Allow serialization of properties created using @property decorator.
• Allow dataclass types to be serialized by a type not inheriting from DataclassSerializer (usually a Field).

Features & fixes:

• Fix EnumField compatibility with drf-yasg.

Breaking changes:

• The serializer field for dataclass fields that have a default value or default value factory, are now marked as optional (required=False).
• Marking dataclass fields with typing.Optional no longer causes the serializer fields to be optional (they will still be marked as nullable). In previous versions these fields would be optional, which broke if a field had no default value. Due to the preceding change, the common case of fields marked with typing.Optional and None as a default value, have no change in behaviour.
• Drop support for generic typing.Final type hints (without the type specified), as typing.Final was never supposed to be used in this way, and Python 3.10 will drop support for it.

Features & fixes:

• Support overriding serializer for a nested dataclass using serializer_field_mapping.
• Support overriding serializer for all nested dataclasses using serializer_dataclass_field property.
• Support partial updates of nested dataclasses.
• Support bound type variables.
• Support field generation for enumerations.
• Support specifying serializer field configuration in dataclass field metadata.
• Fix value for non-specified optional fields in validated_data on serializers with many=True.

Breaking changes:

• The validated_data representation no longer contains the rest_framework.fields.empty sentinel value for unsupplied fields. This reverts the breaking change from v0.7.

Features & fixes:

• Don't install tests into distributed packages.

Breaking changes:

• The validated_data representation now contains the rest_framework.fields.empty sentinel value for fields where no value was provided, instead of the default of the dataclass field. The value returned by save() is unchanged. This was necessary to support partial updates.

Features & fixes:

• Improved Python 3.9 compatibility.
• Support partial updates.
• Support standard collection generics (PEP 585).
• Support non-generic list and dict typehints.
• Support final fields (PEP 591).
• Support auto-generation for list or dictionaries of Any or variable type.
• Set default max_digits and decimal_places for DecimalField.
• Improved error message when automatic field type deduction fails.