Robert Bradshaw created BEAM-12827:
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             Summary: Let TestStream primitive always produce bytes.
                 Key: BEAM-12827
                 URL: https://issues.apache.org/jira/browse/BEAM-12827
             Project: Beam
          Issue Type: Bug
          Components: beam-model, sdk-java-core, sdk-py-core
            Reporter: Robert Bradshaw


Having bytes encoded with an arbitrary coder in TestStream causes complications 
in a portable implementation. See discussion at 
https://lists.apache.org/thread.html/r65c3464010372b442365ac38601a0312081ae3dcfb77e7eb64ff811b%40%3Cdev.beam.apache.org%3E

A solution is to have TestStream always produce bytes, and have the 
public-facing transform be a composite that composes a byte-producing primitive 
with a decoding step.



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