[3.9] bpo-40780: Fix failure of _Py_dg_dtoa to remove trailing zeros (GH-20435) #20514
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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
(cherry picked from commit 895c9c1)
Co-authored-by: Mark Dickinson mdickinson@enthought.com
https://bugs.python.org/issue40780