this is quite basic, uses a snapshot style history instead of a command-style storage, where we could store forward/reverse callbacks. as a result, this can presently only be used for storing and loading full snapshots. you cannot undo favourites/ratings with this model. to improve this, i would probably update this down the line to make each item of the undostack store a: {forwardOp, reverseOp} and the queue snapshotting logic can be augmented to simply be: {() => {return newState;}, () => {return oldState;}} Signed-off-by: oppiliappan <me@oppi.li>