#5127: Even on narrow unicode builds, the C functions that access the Unicode

Database (Py_UNICODE_TOLOWER, Py_UNICODE_ISDECIMAL, and others) now accept
and return characters from the full Unicode range (Py_UCS4).

The differences from Python code are few:
- unicodedata.numeric(), unicodedata.decimal() and unicodedata.digit()
  now return the correct value for large code points
- repr() may consider more characters as printable.

Lib/test/test_unicode.py

@@ -1353,6 +1353,10 @@ class UnicodeTest(string_tests.CommonTest,
         self.assertEqual(repr(s1()), '\\n')
         self.assertEqual(repr(s2()), '\\n')
 
+    def test_printable_repr(self):
+        self.assertEqual(repr('\U00010000'), "'%c'" % (0x10000,)) # printable
+        self.assertEqual(repr('\U00011000'), "'\\U00011000'")     # nonprintable
+
     def test_expandtabs_overflows_gracefully(self):
         # This test only affects 32-bit platforms because expandtabs can only take
         # an int as the max value, not a 64-bit C long.  If expandtabs is changed