[SR-Dev] new operators & if($v) behaviour

[Juha Heinanen]

andrei,

in my opinion we should only allow boolean result in condition
expressions.

so if someone want to test if a pv value is null, empty string, 0,
undefined, etc., the test should be explicit, like using your functions

 > defined($v)
 > strempty($v)
 > strlen($v)

but i'm not sure if it is in all cases possible to tell apart if a
pseudo variable is undefined or if its value is null or 0.  at least in
the pass this has caused lots of confusion and if we can get it now
cleared, it would be great.

-- juha