Method write

gjs/engine.cpp:152–156

    static constexpr uint32_t STRUCTURED_CLONE_TAG = JS_SCTAG_USER_MIN;

    bool write(JSContext* cx [[maybe_unused]],
               JSStructuredCloneWriter* writer) override {
        g_assert_not_reached();
        return JS_WriteUint32Pair(writer, STRUCTURED_CLONE_TAG, 1);
    }

    bool isSystemOrAddonPrincipal() override { return true; }