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Comments on the patch.
-PyAPI_FUNC(PyObject *) _PyComplex_FormatAdvanced(PyObject *obj,
+PyAPI_FUNC(int) _PyComplex_FormatWriter(PyObject *obj,
Even if it is a private function, I prefer to rename it because its API does change.
/* Use the inlined version in unicodeobject.c */
#define _PyUnicodeWriter_prepare _PyUnicodeWriter_prepare_inline
#define _PyUnicodeWriter_write_substr _PyUnicodeWriter_write_substr_inline
#define _PyUnicodeWriter_write_str _PyUnicodeWriter_write_str_inline
#define _PyUnicodeWriter_write_char _PyUnicodeWriter_write_char_inline
Inlining may be removed to simplify the code (but inlining does speed up the code a little bit). Or the opposite: this code should be moved to a new "unicodewriterinline.h" file which would be included by unicodeobject.c and formatter_unicode.c.