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  1. or download this
    
    cmpthese -1,{
    ...
        a => q[ my @a = '0001' .. '1000'; $_ += 0 for @a; ],
        b => q[ my @b = '0001' .. '1000'; my @new; push @new, $_ + 0 while
    + defined( $_ = shift @b ) ],
    };
    
  2. or download this
        Rate    b    c    a    d
    b 1267/s   -- -29% -37% -63%
    c 1794/s  42%   -- -10% -47%
    a 2000/s  58%  11%   -- -41%
    d 3413/s 169%  90%  71%   --