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