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use strict;
use warnings;
...
  items  => \&items,
  hasheq => \&hasheq,
});

Benchmark: timing 10000 iterations of hasheq, items, slices...
    hasheq:  3 wallclock secs ( 2.97 usr +  0.00 sys =  2.97 CPU) @ 33
+67.00/s (n=10000)
...
items  2392/s     --   -29%   -29%
hasheq 3367/s    41%     --    -0%
slices 3378/s    41%     0%     --