+;;;
+;;; Given a pathname designator, some quality to query for, return one
+;;; of a pathname, a universal time, or a string (a file-author), or
+;;; NIL. QUERY-FOR may be one of :TRUENAME, :EXISTENCE, :WRITE-DATE,
+;;; :AUTHOR. If ERRORP is false, return NIL in case the file system
+;;; returns an error code; otherwise, signal an error. Accepts
+;;; logical pathnames, too (but never returns LPNs). For internal
+;;; use.