feat: iterable aware firstValue / head helper - #1918
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Closes toss#1796. Add firstValue(iterable) that pulls a single value via the iterator protocol (Symbol.iterator().next().value), returning the first value of any iterable (arrays, sets, maps, generators, strings) or undefined if empty. Lazy: does not consume the rest of the iterable.
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Closes #1796.
Add firstValue(iterable) that pulls a single value via the iterator protocol (Symbol.iterator().next().value), returning the first value of any iterable (arrays, sets, maps, generators, strings) or undefined if empty. Lazy: does not consume the rest of the iterable.