Marshmallow

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Bug fixes:

- Fix typing for ``Schema.dump[s]`` (:pr:`1416`).

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Features:

- Add type annotations to ``marshmallow.schema`` and ``marshmallow.validate`` (:pr:`1407`, :issue:`663`).

Bug fixes:

- Fix compatibility with Python < 3.5.3 (:issue:`1409`). Thanks :user:`lukaszdudek-silvair` for reporting.

Refactoring:

- Remove unnecessary ``BaseSchema`` superclass (:pr:`1406`).

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Bug fixes:

- Restore inheritance hierarchy of ``Number`` fields (:pr:`1403`).
``fields.Integer`` and ``fields.Decimal`` inherit from ``fields.Number``.
- Fix bug that raised an uncaught error when a nested schema instance had an unpickleable object in its context (:issue:`1404`).
Thanks :user:`metheoryt` for reporting.

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Features:

- Add more type annotations (:issue:`663`).
Type information is distributed per `PEP 561 <https://www.python.org/dev/peps/pep-0561/>`_ .
Thanks :user:`fuhrysteve` for helping with this.

Bug fixes:

- Includes bug fix from 2.20.5.

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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``.

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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`).