Discrepancy in documentation - the Run object

The Run object has member expires_at which seems to suggest it’s a non-nullable integer but the example provided (directly to the right) shows expires_at set to null when status is set to completed.

It’s confusing that the other timestamps (created_at, cancelled_at, etc.) specify their respective nullability but expires_at does not.

It should either be obvious that expires_at is nullable or a Run in the “completed” status should not return a null value for expires_at.