Marshmallow

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

Features:

- Allow input value to be included in error messages
for a number of fields (:pr:`1129`). Thanks :user:`hdoupe` for the PR.
- Improve default error messages for ``OneOf`` and ``ContainsOnly``
(:issue:`885`). Thanks :user:`mcgfeller` for the suggestion
and :user:`maxalbert` for the PR.

Deprecations/Removals:

- Remove ``fields.FormattedString`` (:issue:`1141`). Use
``fields.Function`` or ``fields.Method`` instead.

Bug fixes:

- Includes bug fix from 2.19.2.

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

Features:

- Add ``fields.Tuple`` (:issue:`1103`) Thanks :user:`zblz` for the PR.
- Add ``fields.Mapping``, which makes it easier to support other
mapping types (e.g. ``OrderedDict``) (:issue:`1092`).
Thank :user:`sayanarijit` for the suggestion and the PR.

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

Features:

- Make the error messages for "unknown fields" and "invalid data type"
configurable (:issue:`852`). Thanks :user:`Dunstrom` for the PR.
- ``fields.Boolean`` parses ``"yes"``/``"no"`` values (:pr:`1081`).
Thanks :user:`r1b`.

Other changes:

- *Backwards-incompatible with previous 3.x versions*: Change ordering
of ``keys`` and ``values`` arguments to ``fields.Dict``.
- Remove unused code in ``marshmallow.utils``: ``is_indexable_but_not_string``,
``float_to_decimal``, ``decimal_to_fixed``, ``from_iso`` (:pr:`1088`).
- Remove unused ``marshmallow.compat.string_types``.

Bug fixes:

- Includes bug fix from 2.18.0.

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

Features:

- Add ``register`` *class Meta* option to allow bypassing marshmallow's
internal class registry when memory usage is critical (:issue:`660`).

Bug fixes:

- Fix serializing dict-like objects with properties (:issue:`1060`).
Thanks :user:`taion` for the fix.
- Fix populating ``ValidationError.valid_data`` for ``List`` and
``Dict`` fields (:issue:`766`).

Other changes:

- Add ``marshmallow.__version_info__`` (:pr:`1074`).
- Remove the ``marshmallow.marshalling`` internal module (:pr:`1070`).
- A ``ValueError`` is raised when the ``missing`` parameter is passed
for required fields (:issue:`1040`).
- Extra keyword arguments passed to ``ValidationError`` in validators
are no longer passed to the final ``ValidationError`` raised upon
validation completion (:issue:`996`).

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

Features:

- *Backwards-incompatible*: Rework ``ValidationError`` API.
It now expects a single field name, and error structures are merged
in the final ``ValidationError`` raised when validation completes.
This allows schema-level validators to raise errors for individual
fields (:issue:`441`). Thanks :user:`maximkulkin` for
writing the original ``merge_errors`` implementation in :pr:`442` and thanks
:user:`lafrech` for completing the implementation in :pr:`1026`.

Bug fixes:

- Fix ``TypeError`` when serializing ``None`` with ``Pluck`` (:pr:`1049`).
Thanks :user:`toffan` for the catch and patch.

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

Bug fixes:

- Includes bug fixes from 2.16.2 and 2.16.3.