docs: function (keyName, decrement) {
        if (_emberMetalIs_none.default(decrement)) {
          decrement = 1;
        }
        _emberMetalDebug.assert('Must pass a numeric value to decrementProperty', !isNaN(parseFloat(decrement)) && isFinite(decrement));
        return _emberMetalProperty_set.set(this, keyName, (_emberMetalProperty_get.get(this, keyName) || 0) - decrement);
      }