XXX old formatting

Author: skirpichev

Objects/unicodeobject.c

@@ -13899,8 +13899,17 @@ mainformatlong(PyObject *v,
             iobj = PyNumber_Long(v);
         }
         if (iobj == NULL ) {
-            if (PyErr_ExceptionMatches(PyExc_TypeError))
+            if (PyErr_ExceptionMatches(PyExc_TypeError)) {
+                if (type == 'x' || type == 'X') {
+                    PyErr_Clear();
+                    if (PyFloat_Check(v)) {
+                        if (formatfloat(v, arg, NULL, writer) == -1)
+                            return -1;
+                        return 1;
+                    }
+                }
                 goto wrongtype;
+            }
             return -1;
         }
         assert(PyLong_Check(iobj));