refactor: add error message for wrapped variable in collect_var!
#3616
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It is very easy to end up with a wrapped variable (
Num
/Arr
) in this function and think "this should just unwrap whatever it gets". That is not true, and this function should only ever receive unwrapped values. The error message makes this very clear and helps avoid more insidious bugs involvingNum
s creeping inside symbolic expressions.