in reply to
Re^2: How to assign string "0" in short circuit
in thread How to assign string "0" in short circuit
Short circuit operators always evaluate in boolean context. In boolean context there are only true and false. The string "0" and numberic 0 are, among others, false. But, 0 (or empty string) is defined. So you need to check for defined-ness to allow them. See True or False? A Quick Reference Guide.
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