Issue #7632: Fix a serious wrong output bug for string -> float conversion.
Also remove some now unused variables, and add comments clarifying the
possible outputs of the parsing section of _Py_dg_strtod.  Thanks
Eric Smith for reviewing.
diff --git a/Lib/test/test_strtod.py b/Lib/test/test_strtod.py
index 7800a73..0c6f59d 100644
--- a/Lib/test/test_strtod.py
+++ b/Lib/test/test_strtod.py
@@ -258,6 +258,8 @@
             # issue 7632 bug 5: the following 2 strings convert differently
             '1000000000000000000000000000000000000000e-16',
             #'10000000000000000000000000000000000000000e-17',
+            # issue 7632 bug 8:  the following produced 10.0
+            '10.900000000000000012345678912345678912345',
             ]
         for s in test_strings:
             self.check_strtod(s)