Robert Bradshaw created BEAM-11882:
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Summary: Avoid returning bare lists for iterables in
CombineFn.merge_accumulators
Key: BEAM-11882
URL: https://issues.apache.org/jira/browse/BEAM-11882
Project: Beam
Issue Type: New Feature
Components: sdk-py-core
Reporter: Robert Bradshaw
The only contract here is that what is returned here is an iterable. We should
avoid returning a more concrete class to better set expectations when running
on distributed runners.
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