Remove the simple slicing API. All slicing is now done with slice objects.

Lib/test/test_support.py

@@ -423,11 +423,7 @@ _1M = 1024*1024
 _1G = 1024 * _1M
 _2G = 2 * _1G
 
-# Hack to get at the maximum value an internal index can take.
-class _Dummy:
-    def __getslice__(self, i, j):
-        return j
-MAX_Py_ssize_t = _Dummy()[:]
+MAX_Py_ssize_t = sys.maxsize
 
 def set_memlimit(limit):
     import re