-#define Cupcase(x) (_c_upper[(unsigned char)(x)]) /** Convert a letter to upper case, leave non-letter characters unchanged. **/
-#define Clocase(x) (_c_lower[(unsigned char)(x)]) /** Convert a letter to lower case, leave non-letter characters unchanged. **/
+#define Cupcase(x) (_c_upper[(byte)(x)]) /** Convert a letter to upper case, leave non-letter characters unchanged. **/
+#define Clocase(x) (_c_lower[(byte)(x)]) /** Convert a letter to lower case, leave non-letter characters unchanged. **/