[issue1725] -1e-1000 converted incorrectly

[Mark Dickinson]

Mark Dickinson added the comment:

Presumably  float('-1e-1000') should also give -0.  (?)
If so, then it looks as though the fix ought to go in PyOS_ascii_strtod: 
one obvious possibility would be to replace any leading '-' sign by a '+' 
sign before calling the system strtod, then negate the result afterwards.

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