[wip] push nodes impl #53
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This PR maybe adds eagerly-updated 'push' nodes, which can be used selectively to avoid traversing sections of the graph, and to set historyLength to 1 in some cases.
when you call atom.set, whether in a transaction or not, if the atom has any direct 'push' children, those children will be updated immediately. And if those children have any direct 'push' children they will also be updated immediately, and so on.
Then when the final reaction sweep is done when the root transaction commits, if a push node is encountered which did not change during the transaction, it is not traversed.
Before merging:
numPushyChildrento atoms/computeds to allow avoiding push traversal. Or maybe use a separate lazily-instantiated ArraySet?