Hmm I don't seem to have made my position clear. What I mean was, occasionally in data, an empty string and NULL are equivalent. Occasionally, 0 and NULL, or 0 and "" are equivalent. Effectively testing this in Perl is a bit of a pain, and in SQL it's even a lot worse because 
SELECT * FROM mytable WHERE foo=foo

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will not show the records where foo is null. Purists might say this is how it should be, but I think it's just not very practical.

It'd be nice if you provided a simple means to test if a value is, say, NULL, 0 or "", perhaps using something like in (as in Mysql): 

if($foo in (0, "", undef)) ...

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I'm actually not even sure that NULL is a valid value for the IN list in Mysql...

In reply to Re^3: RFC: Verify Interpreter and Language by bart
in thread RFC: Verify Interpreter and Language by exussum0

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