Dimitry Andric added the comment:

STINNER Victor writes:
> Would it be technically possible to completely get ride of the union? 

Probably, it's just more work, and it has to be done pretty carefully to avoid 
regressions.  It seems Python already does some exercising of these dtoa 
functions in its test suite, but ideally you would want to check against 
upstream's full tests, if those exist.

There are probably many edge cases for a set of tricky functions like this...

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<http://bugs.python.org/issue30124>
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