Marshmallow

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Bug fixes:

- Fix bug that raised an uncaught error when passing both a schema instance and ``only`` to ``Nested`` (:pr:`1395`).
This bug also affected passing a schema instance to ``fields.Pluck``.

++++++++++++++++++

Bug fixes:

- Fix propagating dot-delimited ``only`` and ``exclude`` parameters to nested schema instances (:issue:`1384`).
- Includes bug fix from 2.20.4 (:issue:`1160`).

++++++++++++++++++

Bug fixes:

- Handle when ``data_key`` is an empty string (:issue:`1378`).
Thanks :user:`jtrakk` for reporting.

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Bug fixes:

- Includes bug fix from 2.20.3 (:pr:`1376`).
- Fix incorrect ``super()`` call in ``SchemaMeta.__init__`` (:pr:`1362`).

++++++++++++++++++

Bug fixes:

- Fix bug when nesting ``fields.DateTime`` within ``fields.List`` or ``fields.Tuple`` (:issue:`1357`).
This bug was introduced in 3.0.0rc9. Thanks :user:`zblz` for reporting.

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Features:

- Optimize ``List(Nested(...))`` (:issue:`779`).
- Minor performance improvements and cleanup (:pr:`1328`).
- Add ``Schema.from_dict`` (:issue:`1312`).

Deprecations/Removals:

- ``Field.fail`` is deprecated. Use ``Field.make_error`` instead.
- Remove UUID validation from ``fields.UUID``, for consistency with other fields (:issue:`1132`).

Support:

- Various docs improvements (:pr:`1329`).