Deterministic Proposal

[Jussi Kalliokoski]

> deterministic function sum(a, b) { return a + b; }
>

Ironically, having the engine decide when to memoize would make the
"deterministic" functions non-deterministic:

deterministic function foo(a, b) { return { a, b }; }
foo(1, 2) === foo(1, 2) // may or may not be true
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