[issue5859] Remove implicit '%f' -> '%g' switch from float formatting.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

No new test failures on Linux or OS X, with or without the fallback code.  
I've committed this in r72161.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5859>
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