For example *_to_str natives SHOULD return array/string instead. Sure it might be "limited" (if that's the right term) but still there would be no need to declare a string and use them (which is a bit annoying).
Seems to be more efficient, right?
You still need to "declare a string to use them", otherwise where would the result go?
Also, why do you talk about efficiency here? It's unrelated.
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