Looks rad, I was going to look into some b-trees for a use-case where I need an ordered map of things similar to integers and this might be better. I couldn't

Looks rad, I was going to look into some b-trees for a use-case where I need an ordered map of things similar to integers and this might be better. I couldn't immediately see, is there mention of whether insertions invalidate iterators? Maybe not strictly needed for my use-case but good to know.