public function putMulti(array $arr_entities)
{
// Ensure all the supplied are Entities and have a Kind & Schema
$this->ensureSchema($arr_entities);
// Record the Auto-generated Key IDs against the GDS Entities.
$this->mapAutoIDs($this->upsert($arr_entities));
// Consume schema, clear kind mapper-map(!)
$this->obj_schema = null;
$this->arr_kind_mappers = [];
}