RDAMap.move problem

[hediyi]

const M = new MuRDAMap(new MuVarint(), new MuRDARegister(new MuVarint()))
const store = M.createStore({0: 0, 1: 1})
const dispatchers = M.action(store)

// { type: 'move', data: MuStruct { id: 1, key: 0, sequence: 2 } }
const mv = dispatchers.move(1, 0)
// { type: 'move', data: MuStruct { id: 2, key: 1, sequence: 1 } }
const mvi = store.inverse(M, mv)

store.apply(M, mv)
// { type: 'move', data: MuStruct { id: 2, key: 1, sequence: 1 } }
const mvr = dispatchers.move(0, 1)

The problem comes from we expect applying two identical action objects to the same state to result in different states. Since we're not supposed to touch the state when generating action objects or inverses, either mvi or mvr has to carry extra info to differentiate itself from the other.