Thank you for the suggestion. I will wait for a new version.
However one thing is still not clear to me. Even on new API version will the metafieldsSet querry is sufficient to create_or_update with such input
{
"metafields": {
"key": "global_settings",
"namespace": "appname",
"ownerId": "myappinstallationID",
"type": "json",
"value": "somedatainjsonformat",
}
Or should I use separate queries to check if exist Update if not Create?