P3coregood first issuenew featurepython
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描述
Users are going to mutate inputs and outputs of DoFn inappropriately. We should help their tests fail to catch such mistakes. (Similar to the DirectPipelineRunner in Java SDK)
Imported from Jira BEAM-529. Original Jira may contain additional context. Reported by: altay. This issue has child subcomponents which were not migrated over. See the original Jira for more information.