[docs] [issue15718] Possible OverflowError in __len__ method undocumented (when called via len() function)

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


----------
pull_requests: +1369

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15718>
_______________________________________