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Fixed for 2.4 and the 2.3 maintenance branch, using simpler
test code, and adding a missing Py_XDECREF to the C change.

PEP 302 has also been updated to point out that loaders must
use the existing module in sys.modules, if present, and the
TestImporter in test_importhooks has been changed to do
this.  zipimport, however, does not do this, and that is a
problem that still needs fixing (see bug #856103 for some
other zipimport+reload issues).