objstr: Implement .lower() and .upper().
diff --git a/py/misc.h b/py/misc.h
index 7f3e83d..013b5f1 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -96,6 +96,8 @@
 bool unichar_isprint(unichar c);
 bool unichar_isdigit(unichar c);
 bool unichar_isxdigit(unichar c);
+unichar unichar_tolower(unichar c);
+unichar unichar_toupper(unichar c);
 
 /** variable string *********************************************/