Mark Dickinson added the comment:

Steven: can you explain why you think your code *should* be giving exact 
results for exact powers? Do you have an error analysis that says that should 
be the case?

One issue here is that libm pow functions vary hugely in quality, so any 
algorithm that depends on ** or math.pow is going to be hard to prove anything 
about.

I think the tests should simply be weakened: it's unreasonable to expect 
perfect results in this case.

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nosy: +mark.dickinson

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27761>
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