Hello, I am investigating the use of Numpy (and Numba) for developing a constraint solving library (NUCS) over integers. This library is 100% written in Python, which is not the case with other Python constraint solvers that often include a C or Java constraint solver. Despite this, NUCS is very fast. Of course, I am trying to improve and optimize my code and would be interested in general feedback but also feedback on my use of Numpy. I am also interested in resources on low-level Numpy. Best regards, Yan Georget NUCS github repository: https://github.com/yangeorget/nucs