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Here is the patch for floatobject. I did not convert 2 sites. The first is the round method which clinic explicitly does not support. The second one is the new method. This is the snippet of new method:
float_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
 PyObject *x = Py_False; /* Integer zero */
 static char *kwlist[] = {"x", 0};
 if (type != &PyFloat_Type)
 return float_subtype_new(type, args, kwds); /* Wimp out */
 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:float", kwlist, &x))
 return NULL;
 /* If it's a string, but not a string subclass, use
 PyFloat_FromString. */
 if (PyUnicode_CheckExact(x))
 return PyFloat_FromString(x);
....
If I clinic this method, I could not put custom code before parsing arguments code anymore. This could affect the performance or may not be correct at all.