bpo-40243: Use numeric_changed for UCD.numeric

This was causing `ucd_3_2_0.numeric()` to pick up only decimal
changes between Unicode 3.2.0 and the current version.

Author: wmeehan

Lib/test/test_unicodedata.py

@@ -205,6 +205,12 @@ def test_issue29456(self):
         self.assertEqual(self.db.normalize('NFC', u11a7_str_a), u11a7_str_b)
         self.assertEqual(self.db.normalize('NFC', u11c3_str_a), u11c3_str_b)
 
+    def test_issue40243(self):
+        # BENGALI CURRENCY NUMERATOR FOUR
+        u09f7 = '\u09f7'
+        self.assertEqual(self.db.numeric(u09f7), 0.25)
+        self.assertEqual(self.db.ucd_3_2_0.numeric(u09f7), 4.0)
+
     def test_east_asian_width(self):
         eaw = self.db.east_asian_width
         self.assertRaises(TypeError, eaw, b'a')

Modules/unicodedata.c

@@ -230,9 +230,9 @@ unicodedata_UCD_numeric_impl(PyObject *self, int chr,
             have_old = 1;
             rc = -1.0;
         }
-        else if (old->decimal_changed != 0xFF) {
+        else if (old->numeric_changed != 0.0) {
             have_old = 1;
-            rc = old->decimal_changed;
+            rc = old->numeric_changed;
         }
     }