Marshmallow

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Bug fixes:

- ``fields.Boolean`` correctly serializes non-hashable types (:pr:`1633`).
Thanks :user:`jun0jang` for the PR.

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Deprecations:

- ``marshmallow.pprint`` is deprecated and will be removed in marshmallow 4 (:issue:`1588`).

Support:

- Document ``default_error_messages`` on field classes (:pr:`1619`). Thanks :user:`weeix`.

Bug fixes:

- Fix passing ``only`` and ``exclude`` to ``Nested`` with an ordered ``Schema`` (:pr:`1627`).
Thanks :user:`juannorris` for the PR.

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No code changes--only docs and contributor-facing updates in this release.

Support:

- Documentation: improve custom fields example (:issue:`1538`).
Thanks :user:`pablospizzamiglio` for reporting the problem with the
old example and thanks :user:`Resinderate` for the PR.
- Documentation: Split up API reference into multiple pages and
add summary tables (:pr:`1587`). Thanks :user:`EpicWink` for the PR.

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Features:

- Add ``validate.ContainsNoneOf`` (:issue:`1528`).
Thanks :user:`Resinderate` for the suggestion and the PR.

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Bug fixes:

- Fix typing in ``class_registry`` (:pr:`1574`). Thanks :user:`mahenzon`.

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Bug fixes:

- Includes bug fix from 2.21.0.