BUG: diagflat could overflow on windows or 32-bit platforms
#18459
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diagflat could overflow on windows or 32-bit platformsdiagflat could overflow on windows or 32-bit platforms
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Backport of #18455.
Closes #18449.
For particularly large input arrays the
np.diagflatfunction could yield non-zero diagonal elements due to integer overflow,the latter facilitated by the default
np.arangeinteger-dtype beingnp.int32on windows.This PR fixes aforementioned issue by explicitly setting the dtype to
np.intp.