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https://issues.apache.org/jira/browse/BEAM-8629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16972814#comment-16972814
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Robert Bradshaw commented on BEAM-8629:
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This can create incorrect (and hard to debug) behavior where repeated calls to
with_{input,output}_types on an instance can influence the class itself.
> WithTypeHints._get_or_create_type_hints may return a mutable copy of the
> class type hints.
> ------------------------------------------------------------------------------------------
>
> Key: BEAM-8629
> URL: https://issues.apache.org/jira/browse/BEAM-8629
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Robert Bradshaw
> Assignee: Robert Bradshaw
> Priority: Major
>
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