On Thu, Aug 03, 2017 at 09:27:42PM +0200, hw wrote: > > It is nonsense to logically negate a string, and it is nonsense to convert > undefined values into 'false'. Either are neither false, nor true. > > For undefined values, there is no way of deciding whether they are true or > false > because they are undefined. > > When you convert undefined values to false, then you must also convert false > to undefined values. Logic dictates that otherwise undefined values are > not equal to undefined values. Yet perl claims that they are: > > perl -e 'print "true\n" if(undef == undef);' > perl -e 'print "true\n" if(0 == undef);' > > Both is just wrong. The value 0 is defined to the point where you can´t > define > it any more.
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