"Generalization" misused in deque docs

[rschwieb]

BPO	23823
Nosy	@rhettinger

^{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 2015-03-31.14:52:41.896>
created_at = <Date 2015-03-31.13:56:02.405>
labels = ['type-feature', 'invalid', 'docs']
title = '"Generalization" misused in deque docs'
updated_at = <Date 2015-03-31.14:52:41.851>
user = 'https://bugs.python.org/rschwieb'

bugs.python.org fields:

activity = <Date 2015-03-31.14:52:41.851>
actor = 'rhettinger'
assignee = 'docs@python'
closed = True
closed_date = <Date 2015-03-31.14:52:41.896>
closer = 'rhettinger'
components = ['Documentation']
creation = <Date 2015-03-31.13:56:02.405>
creator = 'rschwieb'
dependencies = []
files = []
hgrepos = []
issue_num = 23823
keywords = []
message_count = 2.0
messages = ['239710', '239720']
nosy_count = 3.0
nosy_names = ['rhettinger', 'docs@python', 'rschwieb']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23823'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3', 'Python 3.4', 'Python 3.5', 'Python 3.6']

[rschwieb]

This sentence in the deque docs (https://docs.python.org/2/library/collections.html#collections.deque) is not accurate:

"Deques are a generalization of stacks and queues ..."

Deques are a _specialization_ of stacks and queues. Every deque is-a stack and is-a queue, but saying that "deques generalize stacks and queues" reverses this relationship.

On the surface it might seem minor, but I think it's worth correcting in this case since the "is-a" relationship is so fundamental in computer science. Besides, I'd like to think Python's awesome documentation is above using words to mean the opposite of what they mean :)

[rhettinger]

Sorry, I disagree.