[issue7632] dtoa.c: oversize b in quorem

[Mark Dickinson]

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

I was considering downgrading this to 'normal'.  Then I found Bug 8, and it's a biggie:

>>> 10.900000000000000012345678912345678912345
10.0

Now I'm thinking it should be upgraded to release blocker instead.

The cause is in the _Py_strtod block that starts: 'if (nd > STRTOD_DIGLIM) {'...  It truncates the input to 18 digits, and then deletes trailing zeros.  But the code that deletes the zeros is buggy, and passes over the digit '9' just before the point.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7632>
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