The marshal method allows the hash's internal state to be serialized and
unmarshaled at a later time, without having the re-write the entire stream
of data that was already written to the hash.
Fixesgolang/go#24548
Change-Id: I82358c34181fc815f85d5d1509fb2fe0e62e40bd
Reviewed-on: https://go-review.googlesource.com/103241
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
12892e8c23