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To add a permission for a User, coupling him to a Group, which of the 2 is the right syntax?

```  {
    "namespace": "Group",
    "object": "0a8c8b76-0b2d-4274-a070-ea7abc33497e",
    "relation": "owners",
    "subject_id": "dcf481d7-9740-47ea-ae0c-4155120dc8a9"
  },```
or
``` {
    "namespace": "Group",
    "object": "0a8c8b76-0b2d-4274-a070-ea7abc33497e",
    "relation": "owners",
    "subject_set": {
      "namespace": "User",
      "object": "dcf481d7-9740-47ea-ae0c-4155120dc8a9"
    }
  }```

both would work. I personally prefer the subject set since it is more explicit.