(Not sure what the right list is for this) Hi,
I have started a PR for a "fast_integers" flag for np.isin and np.in1d which greatly increases performance when both arrays are integral. It works by creating a boolean array with elements set to 1 where the parent array (ar2) has elements and 0 otherwise. This array is then indexed by the child array (ar1) to create the output. https://github.com/numpy/numpy/pull/12065 Thoughts on this? Please let me know if you have any questions about my addition. Thank you. Best regards, Miles
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