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https://issues.apache.org/jira/browse/BEAM-11882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549123#comment-17549123
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Danny McCormick commented on BEAM-11882:
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This issue has been migrated to https://github.com/apache/beam/issues/20731
> 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
> Priority: P3
>
> 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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