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Returns TRUE if it is this type.
Returns FALSE for all other values. When passing a function to NATIVE? to be checked, it must be denoted with ":". This is because the ":word" notation passes a word's reference, not the word's value. NATIVE? can only determine whether or not a function is a native if it is passed the function's reference.
probe native? :native? ; it's actually an ACTION! false
probe native? "Vichy" false
probe native? :if true
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