Marshmallow

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Bug fixes:

- Fix behavior for serializing missing data with ``Number`` fields when ``as_string=True`` is passed (:issue:`538`). Thanks :user:`jessemyers` for reporting.

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Bug fixes:

- Use fixed-point notation rather than engineering notation when serializing with ``Decimal`` (:issue:`534`). Thanks :user:`gdub`.
- Fix UUID validation on serialization and deserialization of ``uuid.UUID`` objects (:issue:`532`). Thanks :user:`pauljz`.

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Bug fixes:

- Fix behavior when using ``validate.Equal(False)`` (:issue:`484`). Thanks :user:`pktangyue` for reporting and thanks :user:`tuukkamustonen` for the fix.
- Fix ``strict`` behavior when errors are raised in ``pre_dump``/``post_dump`` processors (:issue:`521`). Thanks :user:`tvuotila` for the catch and patch.
- Fix validation of nested fields on dumping (:issue:`528`). Thanks again :user:`tvuotila`.

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Features:

- Errors raised by pre/post-load/dump methods will be added to a schema's errors dictionary (:issue:`472`). Thanks :user:`dbertouille` for the suggestion and for the PR.

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Bug fixes:

- Fix serialization of ``datetime.time`` objects with microseconds (:issue:`464`). Thanks :user:`Tim-Erwin` for reporting and thanks :user:`vuonghv` for the fix.
- Make ``validates`` consistent with field validator behavior: if validation fails, the field will not be included in the deserialized output (:issue:`391`). Thanks :user:`martinstein` for reporting and thanks :user:`vuonghv` for the fix.

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- ``Decimal`` field coerces input values to a string before deserializing to a `decimal.Decimal` object in order to avoid transformation of float values under 12 significant digits (:issue:`434`, :issue:`435`). Thanks :user:`davidthornton` for the PR.