code: function (keyName, increment) {
        if (_emberMetalIs_none.default(increment)) {
          increment = 1;
        }
        _emberMetalDebug.assert('Must pass a numeric value to incrementProperty', !isNaN(parseFloat(increment)) && isFinite(increment));
        return _emberMetalProperty_set.set(this, keyName, (parseFloat(_emberMetalProperty_get.get(this, keyName)) || 0) + increment);
      }
docs: Set the value of a property to the current value plus some amount.
  ```javascript
  person.incrementProperty('age');
  team.incrementProperty('score', 2);
  ```
  @method incrementProperty
  @param {String} keyName The name of the property to increment
  @param {Number} increment The amount to increment by. Defaults to 1
  @return {Number} The new property value
  @public