Back out sum() change.

pep-3000.txt

@@ -15,9 +15,8 @@ Abstract
 ========
 
 This PEP describes the changes currently envisioned in Python 3.0
-(also called Python 3000), a
-hypothetical future release of Python that can break backwards
-compatibility with the existing body of Python code.
+(also called Python 3000), a hypothetical future release of Python that
+can break backwards compatibility with the existing body of Python code.
 
 The list of features included in this document is subject to change
 and isn't binding on the Python development community; features may be
@@ -90,8 +89,6 @@ Built-ins
 * Introduce ``trunc()``, which would call the ``__trunc__()`` method on its
   argument; suggested use if for objects like float where calling ``__int__()``
   has data loss, but an integral representation is still desired [8]_
-* The second argument to ``sum()`` will returned if the first argument is
-  empty, otherwise it is ignored [10]_
 
 To be removed:
 
@@ -151,9 +148,6 @@ References
 .. [9] Guido's blog ("The fate of reduce() in Python 3000")
    http://www.artima.com/weblogs/viewpost.jsp?thread=98196
 
-.. [10] python-dev email ("Rationale for sum()'s design?")
-   http://mail.python.org/pipermail/python-dev/2005-March/052183.html
-
 
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 =========