What happened?

Change in #33626 changed SerialVersionUID of Coder class.
This lead to different serialized version of Coder. Serialized coder comparison is part of the compatibility check process.

Error observed e.g. in dataflow when upgrading from SDK 2.62 (and lower) to 2.63 (and higher): The Coder or type for step /PubsubUnboundedSource has changed.

Workaround: none/ drain.

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

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