KeyToHash possibly letting key interfaces escape to heap

[karlmcguire]

As brought up in the performance Gopher channel, since we're using interface{} for keys, this call to keyToHash is probably letting the interface escape to heap.

Solution: switch over to string or []byte for public API calls.

[martinmr]

@karlmcguire should the change be for keys or keys and values?

[minhaj-shakeel]

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