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I'd really love to see one that supports a hierarchy of JSON data, such as a treegrid.

Can you explain how such a tree would map inside a graph? I can't think of an obvious use case.

It would be nice if something like that existed, but with much richer features like the libraries above.

IIRC, both datatables [1] and JQGrid [2] do this, right?

How about editing csv files in a git repo?

how much money is that worth to you?