Invalid syntax parsing Named node

When submitting this mutation

{ 
  set {
	_:m <uri> <https://comake.io> .
  } 
}

I get:

{
  "name": "t",
  "url": "http://localhost:8080/mutate?commitNow=true",
  "errors": [
    {
      "message": "strconv.ParseUint: parsing \"https://comake.io\": invalid syntax",
      "extensions": {
        "code": "ErrorInvalidRequest"
      }
    }
  ]
}

I get the same result using Dgraph-js v21.3.1 and through Ratel.
It doesn’t seem to matter what I change the predicate to.

I would expect this transaction to work because it is nearly identical to the code in the first example on this docs page https://dgraph.io/docs/mutations/external-ids/

_:userA <http://schema.org/type> <http://schema.org/Person> .

Dgraph version:
dgraph-personal/v21.12.0-2-gd93ac1a2d

I’m not exactly sure what the documentation is trying to demonstrate there, but if your objective is to save the link as a string in dgraph then this will do it:

{
  set {
    _:m <uri> "https://comake.io" .
  }
}

Yeah, that works. I guess that example is just displaying how you’d write real RDF triples in an RDF store. Thanks!