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use strict;
use warnings;
...
   YourMum  => sub { yourmum() },
   Marshall => sub { marshall() },
};

Benchmark: timing 50000 iterations of Marshall, Orig, YourMum...
  Marshall: 25 wallclock secs (25.16 usr +  0.00 sys = 25.16 CPU) @ 19
+87.52/s (n=50000)
      Orig: 39 wallclock secs (38.83 usr +  0.00 sys = 38.83 CPU) @ 12
+87.73/s (n=50000)
   YourMum: 40 wallclock secs (40.08 usr +  0.00 sys = 40.08 CPU) @ 12
+47.57/s (n=50000)