char'.
(face_cachel_charset_font_metric_info): Likewise.
 
 void
 ensure_face_cachel_complete (struct face_cachel *cachel,
-                            Lisp_Object domain, unsigned char *charsets)
+                            Lisp_Object domain, Charset_ID *charsets)
 {
   int i;
 
 
 void
 face_cachel_charset_font_metric_info (struct face_cachel *cachel,
-                                     unsigned char *charsets,
+                                     Charset_ID *charsets,
                                      struct font_metric_info *fm)
 {
   int i;
 
                                                 Lisp_Object charset);
 void ensure_face_cachel_complete (struct face_cachel *cachel,
                                  Lisp_Object domain,
-                                 unsigned char *charsets);
+                                 Charset_ID *charsets);
 void update_face_cachel_data (struct face_cachel *cachel,
                              Lisp_Object domain,
                              Lisp_Object face);
 void face_cachel_charset_font_metric_info (struct face_cachel *cachel,
-                                          unsigned char *charsets,
+                                          Charset_ID *charsets,
                                           struct font_metric_info *fm);
 void mark_face_cachels (face_cachel_dynarr *elements,
                        void (*markobj) (Lisp_Object));