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I was curious about the whole true/false thing as well with this function.
I suspect part of the reason it's still 1/0 is because it's used as a tri-state function as follows:
1 = In Range
0 = Not In Range (but action is ranged type)
nil = Not a Ranged Action/Spell/Item
Of course tri-state can easily be done with true/false/nil as well but it will behave slightly differently in if statements (perhaps a weak reason, but that's my guess on it).
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