Now
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The conditional expressions used with ':?' can be expensive
eg. exists() does stat(2).
If 'wantit' is FALSE, we are going to discard everything anyway,
so skip evaluating the conditional and expanding either lhs or rhs.
eg. exists() does stat(2).
If 'wantit' is FALSE, we are going to discard everything anyway,
so skip evaluating the conditional and expanding either lhs or rhs.