docs: public void setLanguageVersion(int version)
      {
          if (sealed) onSealedMutation();
          checkLanguageVersion(version);
          Object listeners = propertyListeners;
          if (listeners != null && version != this.version) {
              firePropertyChangeImpl(listeners, languageVersionProperty,
                                 Integer.valueOf(this.version),
                                 Integer.valueOf(version));
          }
          this.version = version;
      }