[Solved] Redux Observable: If the same action is dispatched multiple times, how do I cancel one of them?

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You can use a .filter() predicate to only unsubscribe your mergeMap for the exact uid you are looking for:

export const getUserEpic = action$ => action$
  .ofType(t.GET_USER)
  .mergeMap(action => Observable
    .from(query.findUser(action.uid))
    .map(user => ({ type: t.GET_USER_SUCCESS, user }))
    .takeUntil(
      action$
        .ofType(t.GET_USER_CANCELLED)
        .filter(act => act.uid === action.uid)
    )

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solved Redux Observable: If the same action is dispatched multiple times, how do I cancel one of them?