[]byte is mutable in Go, but string is readonly, so []byte(string) in Go is
actually allocate&memcopy, and this operation is costly.
Sometimes, we need a readonly []byte parameter but we have string only, and
we have no choice but allocate&memcopy to make a new []byte variable from
string.
Eg: net.Send([]byte("ping")) is costly, but net.Send(readonly
[]byte("ping")) can be cheaply.
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