js/libs/ember-1.5.1.js
function(key, value) {
    var attributeName = this._unspecifiedAttributeBindings && this._unspecifiedAttributeBindings[key];
    if (attributeName) {
      this._setupAttributeBindingObservation(key, attributeName);
    }

    defineProperty(this, key);
    return set(this, key, value);
  }
function(key, value) {
    var attributeName = this._unspecifiedAttributeBindings && this._unspecifiedAttributeBindings[key];
    if (attributeName) {
      this._setupAttributeBindingObservation(key, attributeName);
    }

    defineProperty(this, key);
    return set(this, key, value);
  }
function ( key , value ) { var attributeName = this . _unspecifiedAttributeBindings && this . _unspecifiedAttributeBindings [ key ] ; if ( attributeName ) { this . _setupAttributeBindingObservation ( key , attributeName ) ; } defineProperty ( this , key ) ; return set ( this , key , value ) ; }
Gets defined after initialization by _applyAttributeBindings
Gets defined after initialization by _applyAttributeBindings