NSRoundUpToMultipleOfPageSize broken?

FROM : mikevann
DATE : Tue Mar 04 19:08:48 2008

I know there's other macros to do this but I was just trying out some 
Foundation utils and found NSRoundUpToMultipleOfPageSize always 
returns 0 (same with round down version).  I saw no information 
regarding this as depreciated or obsolete, so is this a bug or is it 
generally assumed the Foundation utility functions are not to be 
relied upon?