perf(decode): inline hasNilCode for byte-slice reader#56
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When decoding from a byte slice (Unmarshal path), peek directly at the underlying data instead of going through two interface method calls (ReadByte + UnreadByte). This saves ~3-7 ns per struct pointer field decode.
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Summary
hasNilCodethat peeks directly at the byte-slice reader's underlying data when decoding viaUnmarshal/ResetBytesReadByte+UnreadByte) per nil check, which is called for every pointer field during struct decodeBenchmark (vs v6 baseline)
Test plan
go test -count=1 ./...— all passgo test -short -race -count=1 -timeout=5m ./...— no racesenv GOOS=linux GOARCH=386 go vet ./...— cross-platform check