The upcoming numpy 1.20 release will deprecate np.bool and np.float etc., see https://numpy.org/devdocs/release/1.20.0-notes.html#using-the-aliases-of-builtin-types-like-np-int-is-deprecated

You have some usages of this in your codebase that may throw DeprecationWarnings, we see that in the upstream-dev tests of xarray.

E.g.:

I think the idea is to replace these with bool or np.bool_ (I am never entirely sure what the difference is).