Coalesce synchronous effectful mutations to state #619
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We directly mutate store state when
sendis called, and additionally for each synchronous effect that may feed back into the reducer. This PR collapses all those mutations into a single one so that eachsendresults in a single mutation. For SwiftUI this should result in identical behavior. For UIKit and any other manual subscription to a store, it should result in fewer emissions to contend with.