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{
    my ($end, $curr, $result);
...
        $_factorial->();
    }
}

dragonchild:  4 wallclock secs ( 3.19 usr +  0.00 sys =  3.19 CPU) @ 1
+22695.46/s (n=392012)
   lexical:  3 wallclock secs ( 3.10 usr +  0.00 sys =  3.10 CPU) @ 21
+976.48/s (n=68215)
 recursion:  3 wallclock secs ( 3.08 usr +  0.00 sys =  3.08 CPU) @ 91
+202.59/s (n=281360)
  typeglob:  4 wallclock secs ( 3.14 usr +  0.00 sys =  3.14 CPU) @ 21
+142.77/s (n=66494)