+++++++++++++++++++++
Features:
- Support partial loading of nested fields (:pr:`438`). Thanks
:user:`arbor-dwatson` for the PR. *Note*: Subclasses of ``fields.Nested``
now take an additional ``partial`` parameter in the ``_deserialize``
method.
Bug fixes:
- Restore ``Schema.TYPE_MAPPING``, which was removed in 3.0.0b17 (:issue:`1012`).
Other changes:
- *Backwards-incompatible*: ``_serialize`` and ``_deserialize`` methods of
all ``fields.Field`` subclasses must accept ``**kwargs`` (:pr:`1007`).