csv: Inconsistency re QUOTE_NONNUMERIC

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-04-11.20:41:55.773>
labels = ['type-bug', 'library']
title = 'csv: Inconsistency re QUOTE_NONNUMERIC'
updated_at = <Date 2017-04-19.07:11:22.021>
user = 'https://github.com/tlotze'

bugs.python.org fields:

activity = <Date 2017-04-19.07:11:22.021>
actor = 'corona10'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-04-11.20:41:55.773>
creator = 'tlotze'
dependencies = []
files = []
hgrepos = []
issue_num = 30046
keywords = []
message_count = 5.0
messages = ['291516', '291590', '291862', '291864', '291865']
nosy_count = 4.0
nosy_names = ['serhiy.storchaka', 'xiang.zhang', 'tlotze', 'corona10']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30046'
versions = []