Function equals

Allows quick triple-equal equality check between the values inside two maybe instances without having to unwrap them first.

const a = Maybe.of(3);
const b = Maybe.of(3);
const c = Maybe.of(null);
const d = Maybe.nothing();

Maybe.equals(a, b); // true
Maybe.equals(a, c); // false
Maybe.equals(c, d); // true
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