■

Handling difference in long type in C between unix and windows

NumPy2 lighning talk: Change `np.int`_ to `np.int64` on all platforms - HackMD

np.int64 in python and int64_t in c instead of long would be the choice...

Additional information: API: Make 64bit default integer on 64bit windows by seberg · Pull Request #24224 · numpy/numpy · GitHub

Finally it was found that dtype="int_" and dtype="long" behave differently on Windows. The latter was necessary.