5.0.3: Propagate null_check flag when serializing nested MapAttributes (#908)

Before this change, the Model would propagate null_check to the immediate MapAttributes but then those MapAttributes wouldn't propagate it to deeper-nested ones.

Do not serialize all attributes for updates and deletes

It is more efficient not to serialize attributes you don't need, and it also avoids tripping null-checks on unrelated attributes when doing updates or deletes.

5.0.1

Fix type errors when deriving from a MapAttribute and another type (#…

5.0.0

This is a major release with breaking changes.

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5.0.0b4

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5.0.0b3

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5.0.0b2

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5.0.0b1

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4.3.3

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4.3.2

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