[Types] Adding mention to std::ptrdiff_t, signed counter part of std::size_t

Sorry I saw !21 (merged) to late. I think it is relevant to mention it's signed counterpart

added Documentation Jupyter labels

I did a mistake (one commit was already in a branch and Gitlab automatically closed the MR against my will).

Okay, do I close this?

I will add the content first and will close it (I will reformulate a bit: @steff and @vrouvrea weren't sure std::size_t was a good idea this early and I fear your formulation might be a bit daunting).

I certainly prefer to use the std::size_t and std::ptrdiff to the other alternatives

Integrated.

closed

Me as well. The worry was more to introduce it without the luggage related to STL such as containers.

But I am in line with you - I use std::size_t rather prominently in my code.