*** Benchmark
             Rate pairmap     map     for
pairmap  775527/s      --    -33%    -42%
map     1154992/s     49%      --    -14%
for     1346695/s     74%     17%      --

*** Benchmark
             Rate pairmap     map     for
pairmap  779518/s      --    -34%    -43%
map     1177598/s     51%      --    -13%
for     1360223/s     74%     16%      --

*** Benchmark
             Rate pairmap     map     for
pairmap  781507/s      --    -34%    -43%
map     1178381/s     51%      --    -14%
for     1364313/s     75%     16%      --