code: function (parsedPath) {
        return View._classStringForValue(parsedPath.path, parsedPath.stream.value(), parsedPath.className, parsedPath.falsyClassName);
      }
docs: Given a property name, returns a dasherized version of that
  property name if the property evaluates to a non-falsy value.
  For example, if the view has property `isUrgent` that evaluates to true,
  passing `isUrgent` to this method will return `"is-urgent"`.
  @method _classStringForProperty
  @param property
  @private