Use flat_map {..} instead of map {..}.flatten
Created by: dchelimsky
flat_map is over 40% faster for small arrays (see benchmarks)
Also added crude implementation of flat_map for v1.8.7
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Created by: dchelimsky
flat_map is over 40% faster for small arrays (see benchmarks)
Also added crude implementation of flat_map for v1.8.7