src/Obj.js
function _delete(name) {
    observers[name].unobserve();
    delete observers[name];
    delete u        [name];
    delete shadow   [name];
  }
function _delete(name) {
    observers[name].unobserve();
    delete observers[name];
    delete u        [name];
    delete shadow   [name];
  }
function _delete ( name ) { observers [ name ] . unobserve ( ) ; delete observers [ name ] ; delete u [ name ] ; delete shadow [ name ] ; }
Delete a property. Unobserve it, delete shadow and proxy entries.
Delete a property . Unobserve it delete shadow and proxy entries .