In article <[EMAIL PROTECTED]>, Moritz Lenz <[EMAIL PROTECTED]> wrote:
> brian d foy wrote: > > * If I can match $x to NaN (or its stand-in), what happens when $x is > > undef? > > undef is a property of the container variable (that it holds no value), > whereas NaN is a property of the content (like 1/0). so undef ~~ NaN > should be false IMHO. That's fine, but the question people are going to ask is "if undef isn't a number, why doesn't iot match 'not a number'". If it doesn't match, we have to talk about internals to explain it, which is generlaly not a good idea for beginners :)
