[issue9141] Allow objects to decide if they can be collected by GC

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Look again.  gcmodule specifically takes any objects reachable from
> ob_clear and sees if any of them have side effects when Py_DECREF'd.

has_finalizer() in gcmodule.c doesn't check for weakref callbacks, so a
weakref callback can still be invoked from tp_dealloc.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9141>
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