Finish SF patch 477059: __del__ on new classes vs. GC.
Just doc and NEWS here, about the change in gc.garbage meaning.
diff --git a/Doc/lib/libgc.tex b/Doc/lib/libgc.tex
index cfd563c..589bcb1 100644
--- a/Doc/lib/libgc.tex
+++ b/Doc/lib/libgc.tex
@@ -83,7 +83,11 @@
\begin{datadesc}{garbage}
A list of objects which the collector found to be unreachable
-but could not be freed (uncollectable objects). Objects that have
+but could not be freed (uncollectable objects). By default, this list
+contains only objects with \method{__del__()} methods.\footnote{Prior to
+ Python 2.2, the list contained all instance objects in unreachable
+ cycles, not only those with \method{__del__()} methods.}
+Objects that have
\method{__del__()} methods and create part of a reference cycle cause
the entire reference cycle to be uncollectable. If
\constant{DEBUG_SAVEALL} is set, then all unreachable objects will