;; Pull with ident
(d/pull (d/db conn) '[*] [:person/name+gender ["Lennart" :gender/male]])
=> #:db{:id nil}

;; Resolve ident first
(:db/id (d/pull (d/db conn) '[*] :gender/male))
=> 17592186045417

;; Pull with eid of ident
(d/pull (d/db conn) '[*] [:person/name+gender ["Lennart" 17592186045417]])
=>
{:db/id 17592186045421,
 :person/name "Lennart",
 :person/gender #:db{:id 17592186045417},
 :person/name+gender ["Lennart" 17592186045417]}

(Also, majorly bad example, don’t assume name + gender are unique, but you know, example :’) )

Yes, datomic does not attempt to resolve anything in the “value” slot of a lookup ref. You must provide exactly the value that would be found in the datom’s :v, which for refs is the entity id

At least, that’s the way it behaves now. It seems conceivable that it could act differently.