__Warning:__ there are currently no checks to make sure a `SimplicialComplex` does not contain duplicate simplices, or that all faces are included. Thus, one should be very careful to add all faces and do so exactly once.
__Warning:__ 0-simplices (vertices) are assumed to start with `[0]` and end at `[n]` where `n` is the total number of vertices. You may run into issues if you use a different set of labels.
__Warning:__ the persistence computation currently assumes that the complex is acyclic at the end of the filtration in order to precompute the number of barcode pairs.
