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            Rate no_braces circumfix postderef
no_braces 2.59/s        --       -2%       -7%
circumfix 2.64/s        2%        --       -5%
postderef 2.78/s        7%        5%        --

#!/usr/bin/perl
use warnings;
...
    }
    push @a, $_ for @$a;
}