claudevdm commented on code in PR #34348:
URL: https://github.com/apache/beam/pull/34348#discussion_r2015110707


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sdks/go/pkg/beam/runners/prism/internal/urns/urns.go:
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@@ -124,6 +124,7 @@ var (
        CoderTimer              = cdrUrn(pipepb.StandardCoders_TIMER)
 
        CoderKV                  = cdrUrn(pipepb.StandardCoders_KV)
+       CoderTuple               = "beam:coder:tuple:v1"

Review Comment:
   I chatted with Rebo who said componentizable coders do not play nicely with 
runner side length prefixing. He said adding a tuple coder is the right move 
here, and since Python isn't planning on getting rid of it (?) we might want to 
make it documented as a standard coder.



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