I had noticed in my benchmarking that lookup method in dictionary gets  
called a lot ( a couple of percent of execution time) and the  
loopinvolved always checking to see if the hashed dictionary lookup is  
nil before looking to see if it is the method we want.

Issue is that check is only required 1/20 of the time, so putting it  
after the check for the selector saves a few instructions. Also caching  
the niloops in a register is always helpful for loops.

--
======================================================================== 
===
John M. McIntosh <johnmci at smalltalkconsulting.com> 1-800-477-2659
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
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