deque in-place addition does not return NotImplemented when appropriate

BPO 22779
Nosy @rhettinger, @ethanfurman

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 = 'https://github.com/rhettinger'
closed_at = <Date 2014-10-31.22:23:33.659>
created_at = <Date 2014-10-31.22:14:36.638>
labels = ['type-bug', 'invalid']
title = 'deque in-place addition does not return NotImplemented when appropriate'
updated_at = <Date 2014-10-31.22:23:33.658>
user = 'https://github.com/ethanfurman'

bugs.python.org fields:

activity = <Date 2014-10-31.22:23:33.658>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2014-10-31.22:23:33.659>
closer = 'rhettinger'
components = []
creation = <Date 2014-10-31.22:14:36.638>
creator = 'ethan.furman'
dependencies = []
files = []
hgrepos = []
issue_num = 22779
keywords = []
message_count = 3.0
messages = ['230397', '230398', '230403']
nosy_count = 2.0
nosy_names = ['rhettinger', 'ethan.furman']
pr_nums = []
priority = 'low'
resolution = 'not a bug'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue22779'
versions = ['Python 3.5']