Mark Dickinson 895c9c1d43 bpo-40780: Fix failure of _Py_dg_dtoa to remove trailing zeros (GH-20435) ...

* Fix failure of _Py_dg_dtoa to remove trailing zeros

* Add regression test and news entry

* Add explanation about why it's safe to strip trailing zeros

* Make code safer, clean up comments, add change note at top of file

* Nitpick: avoid implicit int-to-float conversion in tests

2020-05-29 14:23:57 +01:00

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