Should the court of appeals have granted a certificate of appealability on whether a district court may deny a 28 U.S.C. § 2255 evidentiary hearing on the issue of prejudice resulting from counsel's deficient plea representation, where the district court placed on petitioner a burden at the pleading stage to allege facts that would prove—rather than merely support, without contradiction in the record—a claim of prejudice?

Should the court of appeals have granted a certificate of appealability