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As everyone else has asked, what number would you propose it be treated as? Perl doesn't have a single equality operator, it has two which operate on specific types of values:
A numeric value gets promoted to its string representation when used as a string. A string value gets converted to a numeric value (if possible; 0 if it's not a valid numeric representation) when used as a number. So when you consider what could be done with the "wrong" kind of value in a given context there's two possibilities:
Given that the second choice was made, again what other value would you expect? I might could see an argument being made for NaN, but the choice of 0 makes lots of things "just work" nicely (especially for things like quick 1-liners or 5 minute throw-away scripts where you really aren't that concerned with data validation). In reply to Re^3: undef == 0?
by Fletch
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