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Breaking Changes:
- Fix object creation events. Before this fix, creation events were fired on
empty not yet deserialized objects. Also a modified event was fired after
deserializing e newly created object.
Custom content deserializers now must handle the `create` keyword argument,
which determines if deserialization is performed during object creation or
while updating an object.
[buchi]
- Include translated role titles in `sharing` GET.
[lgraf]
- Image URLs are now created using the cache optimized way. Fixes 494.
[erral]