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Hi,
Currently the unique generator keeps the already used elements as array values and performs the lookup with
in_array
to assert that the generated value has not already been used. This operation is a O(n) operation which becomes slower in time for large datasets generation.I refactored this operation to uses array indexes instead, which will leads to hash table lookups that are O(1) operations.
I did a little benchmark generating 10k unixTimes, the generation time is decreased from 1.77 seconds to 0.37 seconds.