crashes when comparing between a Decimal object and a bad Rational object

BPO	31406
Nosy	@skrah, @serhiy-storchaka, @orenmn
PRs	bpo-31406: Fix crashes when comparing between a Decimal object and a bad Rational object #3476 bpo-31406: Fix crash due to lack of type checking in subclassing. #3477 [3.6] bpo-31406: Fix crash due to lack of type checking in subclassing. (GH-3477) #3479

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-09-10.17:07:20.713>
created_at = <Date 2017-09-10.13:25:42.551>
labels = ['extension-modules', '3.7', 'type-crash']
title = 'crashes when comparing between a Decimal object and a bad Rational object'
updated_at = <Date 2017-09-10.17:07:20.712>
user = 'https://github.com/orenmn'

bugs.python.org fields:

activity = <Date 2017-09-10.17:07:20.712>
actor = 'skrah'
assignee = 'none'
closed = True
closed_date = <Date 2017-09-10.17:07:20.713>
closer = 'skrah'
components = ['Extension Modules']
creation = <Date 2017-09-10.13:25:42.551>
creator = 'Oren Milman'
dependencies = []
files = []
hgrepos = []
issue_num = 31406
keywords = ['patch']
message_count = 4.0
messages = ['301809', '301813', '301815', '301817']
nosy_count = 3.0
nosy_names = ['skrah', 'serhiy.storchaka', 'Oren Milman']
pr_nums = ['3476', '3477', '3479']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue31406'
versions = ['Python 3.6', 'Python 3.7']