Function merge

Basic object merger (does not handle Maps, Sets, class instances, etc). Merges like lodash merge* except arrays are not merged position by position, they're just combined. For arrays that just override the existing key use override

The first object is mutated so clone it first if you don't want it mutated. Passing {} as the first param will also work but only for shallow objects.

	merge(base, other) // mutates base
	const merged = merge({}, base, other) // mutates nothing
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* Arrays are not deep merged. They are not cloned if there is no overriding key, and their items are never looked through.