docs: function (key) {
          var binding = getBindings(this)[key];
          if (!binding) {
              return;
          }
  
          delete getBindings(this)[key];
          events.removeListener(binding);
          // Grab current value from bound property
          var val = this.get(key);
          delete getAccessors(this)[key];
          // Set bound value
          this[key] = val;
      }