maint: performance increase for construct
maint: performance increase for construct

Adding a Python int with a numpy.int32 is horribly slow.
I should probably dig in this and create an issue for numpy.

In the end this results in a good performance increase (~15%)
which is very nice.

Signed-off-by: Nick Papior <81a73bca3d342ffee33d7cf845fdbf77b6553831@gmail.com>

zerothi/sisl,zerothi/sisl