Question not identified

QUESTION PRESENTED When a petitioner files a proper application for a certificate of appealability, a single judge grants a defective certificate without objection from the appellee, and the case is fully briefed and set for argument, is 28 U.S.C. §2253’s gatekeeping function satisfied and the appeal should continue, as the Second, Third, Fourth, and Sixth Circuits have held, or may the defect in the certificate be raised sua sponte and the appeal dismissed as the Fifth, Seventh, Eighth, and Ninth Circuits hold and as the Eleventh Circuit did here? i