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Docs: document accepted encoder/decoder signatures on coder.RegisterCoder - #40050

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Docs: document accepted encoder/decoder signatures on coder.RegisterCoder#40050
nitinware wants to merge 1 commit into
apache:masterfrom
nitinware:docs-coder-register-21930

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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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Adds explicit encoder/decoder function signature documentation to
coder.RegisterCoder, matching the signatures already documented on the
top-level beam.RegisterCoder wrapper. NewCustomCoder now points at the
same signature spec.

Addresses apache#21930
@github-actions github-actions Bot added the go label Sep 7, 2026
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