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https://issues.apache.org/jira/browse/BEAM-14250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17517168#comment-17517168
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Robert Bradshaw commented on BEAM-14250:
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A workaround is to define the types in any other module than __main__.
> Coder registration doesn't work for types in main module.
> ---------------------------------------------------------
>
> Key: BEAM-14250
> URL: https://issues.apache.org/jira/browse/BEAM-14250
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Robert Bradshaw
> Assignee: Robert Bradshaw
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This is because type equality is not preserved through pickling. (Similarly
> for any other dynamic types that can't be pickled by reference.)
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