'How to assign a pull request using the REST API?

I'm creating a GitHub pull request using the appropriate REST API. Specifying a single assignee or an assignees (using either the user login or GitHub's internal id) has no effect. The pull request will be created, but without an assignee set. There also seems to be no other endpoint to explicitly assign a pull request to a user. Now I'm wondering whether it's possible at all to set the assignee of a pull request using the REST API?



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