Is it possible to avoid duplicate capacity and size fields?

[QuarticCat]

Given that all vector fields have the same capacity and size, it is redundant to store and operate multiple of them. This might require a re-implementation of all vector methods.

[Luthaf]

This is already tracked by #19, but progress on it is very slow since I do not have a lot of time to work on this project. Please comment over there if you can help or have suggestions!