Rate  for_expr for_block map_block  map_expr      pack
for_expr  42309/s        --       -0%       -2%       -9%      -48%
for_block 42309/s       -0%        --       -2%       -9%      -48%
map_block 43115/s        2%        2%        --       -7%      -47%
map_expr  46394/s       10%       10%        8%        --      -43%
pack      80736/s       91%       91%       87%       74%        --