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#!/usr/bin/perl -w
use strict;
...
            },
    }
);

Benchmark: timing 1000000 iterations of map_browseruk,
 map_browseruk_setup, map_jwkrahn, map_jwkrahn_setup, unpack,
...
411522.63/s n=1000000)
unpack_setup:  1 wallclock secs ( 0.44 usr + 0.00 sys =  0.44 CPU) 
@ 2272727.27/s (n=1000000)