Marshmallow

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

Bug fixes:

- Fix a race condition in validation when concurrent threads use the
same ``Schema`` instance (:issue:`783`). Thanks :user:`yupeng0921` and
:user:`lafrech` for the fix.
- Fix serialization behavior of
``fields.List(fields.Integer(as_string=True))`` (:issue:`788`). Thanks
:user:`cactus` for reporting and :user:`lafrech` for the fix.
- Fix behavior of ``exclude`` parameter when passed from parent to
nested schemas (:issue:`728`). Thanks :user:`timc13` for reporting and
:user:`deckar01` for the fix.

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

Bug fixes:

- :cve:`CVE-2018-17175`: Fix behavior when an empty list is passed as the ``only`` argument
(:issue:`772`). Thanks :user:`deckar01` for reporting and thanks
:user:`lafrech` for the fix.

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

Bug fixes:

- Handle ``UnicodeDecodeError`` when deserializing ``bytes`` with a
``String`` field (:issue:`650`). Thanks :user:`dan-blanchard` for the
suggestion and thanks :user:`4lissonsilveira` for the PR.

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

Features:

- Add ``require_tld`` parameter to ``validate.URL`` (:issue:`664`).
Thanks :user:`sduthil` for the suggestion and the PR.

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

Bug fixes:

- Fix serialization of types that implement `__getitem__`
(:issue:`669`). Thanks :user:`MichalKononenko`.

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

Bug fixes:

- Fix validation of iso8601-formatted dates (:issue:`556`). Thanks :user:`lafrech` for reporting.