http://go-talks.appspot.com/github.com/davecheney/presentations/writing-high-performance-go.slide#30
the above slide says "the conversion of the byte slice to a string" in the
following case will no copy the underlining byte array.
> var m = map[string]string{}
> v, ok := m[string(bytes)]
>
>
If "bytes" is a local variable, it is reasonable the compiler will do the
optimization.
But how about if "bytes" is a global variable?
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