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keys my %cache = @in;
$cache{$_} = KEY($_) for @in;

keys my %cache = @in;
@cache{@in} = map KEY($_) => @in;

keys %h = @a;
@h{ @a } = ... ; # do something useful

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

    Rate   4   3   2   1
4 1507/s  -- -3% -4% -5%
...
1   1.35  3%  -- -0% -0%
2   1.35  3%  0%  -- -0%
3   1.35  3%  0%  0%  --