docs: function Registrations() {
      Object.defineProperty(this,'_registrations',{
          value: {}
          ,enumerable: false
          ,configurable: false
          ,writable: false
      })
      this.get = this.get.bind(this)
      this.put = this.put.bind(this)
      this.clear = this.clear.bind(this)
      this.has = this.has.bind(this)
  }