Factorize fix #11
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Factorize fix #11
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This fixes an issue in the old factorization method, which didn't properly account for missing values. Basically
Should factorize as
[0, 0, -1, -1, 1, 0]. Previously, we didn't handle NA so it was[0, 0, 1, 1, 2, 0].Numba gave a 285x speedup (after JIT warmup) on a benchmark with 10,000 values.