docs: NativeJavaPackage forcePackage(String name, Scriptable scope)
      {
          Object cached = super.get(name, this);
          if (cached != null && cached instanceof NativeJavaPackage) {
              return (NativeJavaPackage) cached;
          }
          String newPackage = packageName.length() == 0
                              ? name
                              : packageName + "." + name;
          NativeJavaPackage pkg = new NativeJavaPackage(true, newPackage, classLoader);
          ScriptRuntime.setObjectProtoAndParent(pkg, scope);
          super.put(name, this, pkg);
          return pkg;
      }