Benchmark: timing 5000000 iterations of json, sereal, store...
      json: 17 wallclock secs (17.53 usr +  0.00 sys = 17.53 CPU) @ 285225.33/s (n=5000000)
    sereal: 22 wallclock secs (21.78 usr +  0.00 sys = 21.78 CPU) @ 229568.41/s (n=5000000)
     store: 49 wallclock secs (49.55 usr +  0.01 sys = 49.56 CPU) @ 100887.81/s (n=5000000)
           Rate  store sereal   json
store  102312/s     --   -56%   -64%
sereal 233863/s   129%     --   -18%
json   286862/s   180%    23%     --