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I found through profiling that batch_list_exact and batch_dict_exact spent a fair amount of time looking up the pickling function. I have found a way to optimize the lookup using a simple heuristic that assume items in dicts and lists have often a common type. So we have save some time by jumping right to the pickling function we need. Here are the result of running the benchmarks:
### fastpickle ###
Min: 0.593904 -> 0.541918: 1.10x faster
Avg: 0.606811 -> 0.564606: 1.07x faster
Significant (t=10.18)
Stddev: 0.01061 -> 0.02733: 2.5760x larger
Timeline: http://tinyurl.com/bwbvw7j
### pickle_list ###
Min: 0.907891 -> 0.915905: 1.01x slower
Avg: 0.970537 -> 0.948349: 1.02x faster
Significant (t=2.08)
Stddev: 0.07107 -> 0.02526: 2.8136x smaller
Timeline: http://tinyurl.com/cmlymq7