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I think this must be a change between 2.5 and 2.6.
In 2.5.1 non-debug (Linux) I consistently see:
>>> print '%d' % y
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: int argument required
In 2.6.5 (Windows via activestate) I see the alternating errors reported here.
In 2.7.2+ debug (Linux) I consistently see:
>>> print '%d' % y
22
XXX undetected error
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: int() argument must be a string or a number, not 'Foo'
[38749 refs]
Note the "XXX undetected error".
In 2.7.2+ non-debug (Linux), I get the alternating errors reported here.
I don't think anything will be done about the problem in 2.6. For 2.7, the "XXX undetected error" should be investigated, and will likely point to the problem.