Mutable Map on Sequence Trie

[Heasummn]

I'm using Sequence Trie for a project, and I would like to mutably map over the children of a given node. However, I cannot mutably modify other elements while doing this because the struct doesn't have a map function that allows a FnMut.

The easy workaround for me was to make the thing that I wanted to mutably modify a RefCell, but that is less than ideal.