Description
Consider:
h := sha256.New() // escapes to heap
h.(encoding.BinaryUnmarshaler).UnmarshalBinary(d) // not devirtualized
h.Write(d) // devirtualizedhttps://go.dev/play/p/JYPsrebi5Z5
h escapes to heap, because the compiler does not take the opportunity to devirtualize the UnmarshalBinary call.
Same thing happens with even a simpler case (hash.Hash always implements io.Writer)
h := sha256.New()
h.Write(d) // devirtualized
h.(io.Writer).Write(d) // not devirtualizedMetadata
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