Build the speedup C-extension against the stable API. This is done by emulating PyUnicode_New()/PyUnicode_WriteChar() with encoding the UCS4 character to UTF-8 and using PyUnicode_FromStringAndSize().

# -*- coding: utf-8 -*-

__comment1 = u"Comment 1"
key1 = u"the value"
key2 = 2
key3 = 5.7
key4 = True
key5 = False
key6 = 0o377
__comment2 = u"Comment no 2"
key7 = u"Umlaute: ÄÖÜäöüß"