unicode_subtype_new() copies also the ascii flag
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 30db418..c3e1f29 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -12846,7 +12846,7 @@
_PyUnicode_STATE(self).interned = 0;
_PyUnicode_STATE(self).kind = kind;
_PyUnicode_STATE(self).compact = 0;
- _PyUnicode_STATE(self).ascii = 0;
+ _PyUnicode_STATE(self).ascii = _PyUnicode_STATE(unicode).ascii;
_PyUnicode_STATE(self).ready = 1;
_PyUnicode_WSTR(self) = NULL;
_PyUnicode_UTF8_LENGTH(self) = 0;