Allow Splittable DoFn itself to be used as the restriction provider.
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core
improvement
P3
python
- Dominant language
- Java
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Description
Binding the provider to the DoFn class itself at construction time can be limiting, we should add an option to use the DoFn instance itself as the restriction provider.
Imported from Jira [BEAM-11354](https://issues.apache.org/jira/browse/BEAM-11354). Original Jira may contain additional context.
Reported by: robertwb.
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