Rate  ref_h hash_h  ref_r  ref_m hash_r hash_m
ref_h  229/s     --   -10%   -13%   -18%   -22%   -30%
hash_h 254/s    11%     --    -3%    -9%   -14%   -22%
ref_r  263/s    15%     3%     --    -6%   -11%   -19%
ref_m  279/s    22%    10%     6%     --    -5%   -14%
hash_r 295/s    29%    16%    12%     6%     --   -10%
hash_m 326/s    42%    28%    24%    17%    11%     --