Implement PEP 393.
diff --git a/Include/floatobject.h b/Include/floatobject.h
index 90f0a45..243914b 100644
--- a/Include/floatobject.h
+++ b/Include/floatobject.h
@@ -113,8 +113,9 @@
/* Format the object based on the format_spec, as defined in PEP 3101
(Advanced String Formatting). */
PyAPI_FUNC(PyObject *) _PyFloat_FormatAdvanced(PyObject *obj,
- Py_UNICODE *format_spec,
- Py_ssize_t format_spec_len);
+ PyObject *format_spec,
+ Py_ssize_t start,
+ Py_ssize_t end);
#endif /* Py_LIMITED_API */
#ifdef __cplusplus