insert or update for iterative and recursive insert #8
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I find it useful to have a new api insert_or_update so we can update with a function the type T with one go, else we have to see if we can find it, and if not then insert, overall it's slower. I'm using it for personal reasons but I though it could be useful for others as well. Hopefully I have not missed a functionality that does this already on the crate.