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Back to you!  Python still doesn't promise anything here, 
and I've got no interest in wading thru reports from 100 
Platforms from Mars.  That's why these tests aren't run by 
default.  You can enable them if you like (and I agree it 
would be interesting), but unless someone in Python 
development is dead serious about supporting this stuff 
(I'm not and can't be), the platform-specific failures that 
pop up will just irritate all involved.

Ensuring that 1e-200**2 doesn't overflow would be a fine 
addition to the std runs-all-the-time test -- except you 
can't know whether 1e-200 is in range for the platform's 
notion of C double, or whether 1e-200**2 is out of range 
(although both are very likely today).