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my @uniq = keys %{{ map { $_ => undef } @proc_name1 }};

use strict;
use warnings;
...
        },
    }
);

           Rate   useRef  useGrep useSlice
useRef   74.3/s       --     -64%     -84%
useGrep   204/s     175%       --     -56%
useSlice  464/s     525%     127%       --