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**Breaking changes**
By default, the client now raises an exception when a 4XX error occurs in a batch request (154)
In order to ignore those errors as before, instantiate the client with ``ignore_batch_4xx=True``.
**New feature**
- Raise a specific ``CollectionNotFound`` exception rather than a generic ``KintoException``.
**Bug fixes**
- Handle date and datetime object in a Kinto payload. They will be
formated as ISO date JSON strings.
**Internal changes**
- Update tests to work with Kinto 11.0.0.
- Update tests to use stdlib mock module.