Deterministic Proposal

[Bradley Meck]

>
> You probably mean "pure", not "deterministic", which has nothing to do
> with this. However, JavaScript is far, far too impure for any such
> annotation to ever make sense or enable any sort of memoization. Consider
> let i = 0
> let o = {valueOf() {return i++}}
> sum(o, 0)
> sum(o, 0)


If type coercion was disabled within "pure" functions I am not sure this
would be a problem.
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