Djangorestframework-reactive

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Fixed
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- Defer ordering unique constraints when updating items
- Dispatch observer evaluations to other workers instead of processing
everything in the same worker
- Fix issues with query interceptor in multiple threads
- Cast primary keys in ORM signals to string to avoid JSON serialization
failures


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Fixed
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- Ignore own ORM updates when processing observers


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Fixed
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- Fix issues with handling observer subscribers


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Changed
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- **BACKWARD INCOMPATIBLE:** Port to Django Channels 2.1 and add support
for running multiple workers.


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Fixed
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- Do not override primary key when an endpoint returns a single item and
it already has a primary key set
- Fix Channels dependencies


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Changed
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- **BACKWARD INCOMPATIBLE:** Use Django Channels for WebSockets


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