Use (potentially overloaded) key() method for finding user (#267)

* Use (potentially overloaded) key() method for finding user

* don't use strict compare for user identifier

src/Users.php

@@ -62,7 +62,7 @@ public function load(Collection $keys): self
      */
     public function find(int|string|null $key): object
     {
-        $user = $this->resolvedUsers->first(fn ($user) => $user->getAuthIdentifier() == $key);
+        $user = $this->resolvedUsers->first(fn ($user) => $this->key($user) == $key);
 
         if ($this->fieldResolver !== null && $user !== null) {
             return (object) ($this->fieldResolver)($user);