[issue26983] float() can return not exact float instance

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6216fb8afa53 by Serhiy Storchaka in branch 'default':
Issue #26983: Fixed test_format failure.
https://hg.python.org/cpython/rev/6216fb8afa53

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<http://bugs.python.org/issue26983>
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