[fuzzy@jason fuzzy]$ perl benchmark_test_strict.pl 

normal var (t0)
===============
 3 wallclock secs ( 3.11 usr +  0.00 sys =  3.11 CPU) @ 643.09/s (n=2000)

reference (t1)
==============
 3 wallclock secs ( 3.10 usr +  0.00 sys =  3.10 CPU) @ 645.16/s (n=2000)

difference (t0, t1)
===================
 0 wallclock secs ( 0.01 usr +  0.00 sys =  0.01 CPU)