Since NumPy 1.20.0, np.bool is deprecated (together with np.int and np.float). We'd like to keep np.bool though, because it's a better name than np.bool_ and is unambiguous.

There was a long email thread on this topic: https://mail.python.org/archives/list/[email protected]/thread/NZWX22G5L7I5LOMKQ7HIRECUZXV6NA34/#NZWX22G5L7I5LOMKQ7HIRECUZXV6NA34. The approach @seberg suggested there was:

1. Go ahead for now (deprecate)
2. Add a FutureWarning at some point that we will start to export np.bool again (but from numpy import * is a problem?)
3. Aim to make np.bool is np.bool_ at some point in the (far) future.

np.bool has now been deprecated for four releases, so it's time to take the next step in the next release (1.24.0).