What other languages use the same data model as Python?

[Chris Torek]

In article <iq1e0j022t7 at news2.newsguy.com> I wrote, in part:
>Like it or not, Python has similar "defined as undefined" grey
>areas: one is not promised, for instance, whether the "is" operator
>is always True for small integers that are equal (although it is
>in CPython), nor when __del__ is called (if ever), and so on.  As
>with the Python-named-Monty, we have "rigidly defined areas of
>doubt and uncertainty".  These exist for good reasons: to allow
>different implementations.

Oops, attribution error: this comes from Douglas Adams rather
than Monty Python.
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In-Real-Life: Chris Torek, Wind River Systems
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