Marshmallow

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Features:

- Add ``partial`` argument to ``Schema.validate`` (:issue:`379`). Thanks :user:`tdevelioglu` for the PR.
- Add ``equal`` argument to ``validate.Length``. Thanks :user:`daniloakamine`.
- Collect all validation errors for each item deserialized by a ``List`` field (:issue:`345`). Thanks :user:`maximkulkin` for the report and the PR.

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Features:

- Allow a tuple of field names to be passed as the ``partial`` argument to ``Schema.load`` (:issue:`369`). Thanks :user:`tdevelioglu` for the PR.
- Add ``schemes`` argument to ``validate.URL`` (:issue:`356`).

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Bug fixes:

- Prevent duplicate error messages when validating nested collections (:issue:`360`). Thanks :user:`alexmorken` for the catch and patch.

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Bug fixes:

- Serializing an iterator will not drop the first item (:issue:`343`, :issue:`353`). Thanks :user:`jmcarp` for the patch. Thanks :user:`edgarallang` and :user:`jmcarp` for reporting.

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Features:

- Add ``skip_on_field_errors`` parameter to ``validates_schema`` (:issue:`323`). Thanks :user:`jjvattamattom` for the suggestion and :user:`d-sutherland` for the PR.

Bug fixes:

- Fix ``FormattedString`` serialization (:issue:`348`). Thanks :user:`acaird` for reporting.
- Fix ``validates`` behavior when used when ``attribute`` is specified and ``strict=True`` (:issue:`350`). Thanks :user:`density` for reporting.

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Features:

- Add ``dump_to`` parameter to fields (:issue:`310`). Thanks :user:`ShayanArmanPercolate` for the suggestion. Thanks :user:`franciscod` and :user:`ewang` for the PRs.
- The ``deserialize`` function passed to ``fields.Function`` can optionally receive a ``context`` argument (:issue:`324`). Thanks :user:`DamianHeard`.
- The ``serialize`` function passed to ``fields.Function`` is optional (:issue:`325`). Thanks again :user:`DamianHeard`.
- The ``serialize`` function passed to ``fields.Method`` is optional (:issue:`329`). Thanks :user:`justanr`.

Deprecation/Removal:

- The ``func`` argument of ``fields.Function`` has been renamed to ``serialize``.
- The ``method_name`` argument of ``fields.Method`` has been renamed to ``serialize``.

``func`` and ``method_name`` are still present for backwards-compatibility, but they will both be removed in marshmallow 3.0.