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

_keys: 0
_scalar_keys: 0
...
_if           384350/s           1%           --         -92%         
+-92%
_keys        4930608/s        1198%        1183%           --         
+ -1%
_scalar_keys 4996935/s        1215%        1200%           1%         
+  --