cubicweb #1516432 foaf format - missing attributes ? [open]

I am wondering if the foaf format generated by cubicweb is correct, for example https://www.cubicweb.org/cwuser/alutz?vid=foaf gives

<foaf:Person rdf:about="https://www.cubicweb.org/cwuser/alutz#user"> [...]

The referenced URL should serve rdf+foaf shouldn't it ? is it not missing a "?vid=foaf" ?

Also, it seems to be missing a rdf:ID="me", rdf:ID="user" or rdf:ID="alutz" which is used for #user at the end of an URI.

Another question : should https://www.cubicweb.org/cwuser/?vid=foaf be used ? And if so the same missing features seem to apply...