byte-opt.el vs declare

[Sam Steingold]

I thought that byte-opt was intended to set `pure'. `side-effect-free'
&c properties for functions that are defined in C and functions defined
in Lisp should get these from `declare'.

However, I see that, e.g., `xor' uses `declare' but `string-prefix-p' is
listed in byte-opt and does not have a declaration.

What is the official policy?

Thank you.

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