Benchmark: timing 10000 iterations of match, swap...
     match:  1 wallclock secs ( 1.26 usr +  0.01 sys =  1.27 CPU) @ 7874.02/s (n=10000)
      swap:  1 wallclock secs ( 1.01 usr +  0.01 sys =  1.02 CPU) @ 9803.92/s (n=10000)
        Rate match  swap
match 7874/s    --  -20%
swap  9804/s   25%    --