there's some problem with your patch :
abs: returns number, not mixed
we don't use "number" but "int" or "float"
Well, we use "number", or at least it is documented that we use that in case any number is acceptable as a parameter...
http://www.php.net/manual/en/language.pseudo-types.php
oups my mistake. that's right and it's used in math's function only (shamefull).
didou
