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#!/usr/bin/perl

...
        }
    },
});

              Rate     cross2 intervals2  intervals      cross
cross2     10490/s         --        -2%       -43%       -55%
intervals2 10742/s         2%         --       -42%       -54%
intervals  18408/s        75%        71%         --       -22%
cross      23526/s       124%       119%        28%         --

           s/iter intervals2     cross2  intervals      cross
intervals2   48.2         --       -20%       -63%       -81%
cross2       38.6        25%         --       -54%       -77%
intervals    17.8       171%       117%         --       -49%
cross        9.02       434%       328%        97%         --