[development] some performance notes

[Chris Johnson]

Interestingly, most of the is_array() calls that are *not* checking for for 
singleton versus array arguments appear to have been just added to handle the 
new Forms API coding using arrays.

There is lots of code that looks like this:

   if (is_array($form[$module][$key]) ...



I'm not sure what to make of it, but I thought it was interesting that the 
Forms API has resulted in lots of new is_array() calls.


..chrisxj