[PR] Docs: document accepted encoder/decoder signatures on coder.RegisterCoder [beam]

Mon, 07 Sep 2026 15:27:05 -0700 


nitinware opened a new pull request, #40050:
URL: https://github.com/apache/beam/pull/40050

   Addresses #21930
   
   Adds explicit encoder/decoder function signature documentation to
   `coder.RegisterCoder`, matching the four signatures already documented on
   the top-level `beam.RegisterCoder` wrapper in `forward.go`. Also adds a
   short note on `NewCustomCoder` pointing at the same signature spec, since
   it accepts the same functions.
   
   Docs-only change — no behavior modification. `go vet` and `go build`
   on `pkg/beam/core/graph/coder/...` both clean.
   
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