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          Rate   basic     GRT      ST keysort
basic   1.66/s      --    -88%    -89%    -91%
...
GRT     13.3/s    681%      --    -15%    -27%
ST      15.6/s    817%     17%      --    -14%
keysort 18.3/s    972%     37%     17%      --

#!/usr/bin/perl
use strict;
...
    GRT     => \&GRT,
    keysort => \&keysort,
} );