code: function Proposer (paxos, promise) {
      this._paxos = paxos
      this.collapsed = true
      this.promise = Monotonic.increment(promise, 0)
      this.proposals = []
      this.register = {
          body: {
              promise: paxos.log.head.body.promise,
              body: paxos.log.head.body.body,
              previous: paxos.log.head.body.previous
          },
          previous: null
      }
      this.proposal = null
  }
docs: TODO Convert from a government structure. TODO Really need to have the value for previous, which is the writer register.