docs: function () {
          var binding = getBinding(this.props);
          if (binding) {
            if (binding instanceof Binding) {
              return binding;
            } else if (typeof binding === 'object') {
              var keys = Object.keys(binding);
              return keys.length === 1 ? binding[keys[0]] : binding['default'];
            }
          } else {
            return this.observedBindings && this.observedBindings[0];
          }
        }