kennknowles commented on code in PR #34348:
URL: https://github.com/apache/beam/pull/34348#discussion_r2014784811


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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'm curious why it came up vs "just working" like you'd expect with other 
`KV(key, whatever)` objects. The process of submitting portably should result 
in a length-prefix coder wrapper if needed so the runner can just pass the 
bytes through.



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