internal/format: return correct byte count from writeWrapped#698
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FiloSottile merged 2 commits intoFiloSottile:mainfrom Mar 20, 2026
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writeWrappedslices its argumentpdown to zero in a loop, then returnslen(p)— always(0, nil)on success. This violates theio.Writercontract.Harmless today because
encoding/base64ignores the count, butWrappedBase64Encoder/WriterFuncare exported.Fix: save the original length before the loop.
Test:
go test ./internal/format/ -run TestWriteWrappedReturnsCorrectLength -v