Benchmark: timing 1000000 iterations of tin1, tin2, tin3...
      tin1:  1 wallclock secs ( 0.59 usr +  0.00 sys =  0.59 CPU) @ 1686340.64/s (n=1000000)
      tin2:  1 wallclock secs ( 0.75 usr +  0.00 sys =  0.75 CPU) @ 1333333.33/s (n=1000000)
      tin3:  3 wallclock secs ( 2.22 usr +  0.00 sys =  2.22 CPU) @ 450450.45/s (n=1000000)
          Rate tin3 tin2 tin1
tin3  450450/s   -- -66% -73%
tin2 1333333/s 196%   -- -21%
tin1 1686341/s 274%  26%   --