global / nonlocal interference : is this a bug, a feature or a design hole ?

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-12-18.09:59:49.568>
labels = ['interpreter-core', 'type-bug']
title = 'global / nonlocal interference : is this a bug, a feature or a design hole ?'
updated_at = <Date 2017-12-20.16:10:15.703>
user = 'https://bugs.python.org/Camion'

bugs.python.org fields:

activity = <Date 2017-12-20.16:10:15.703>
actor = 'skrah'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2017-12-18.09:59:49.568>
creator = 'Camion'
dependencies = []
files = []
hgrepos = []
issue_num = 32361
keywords = []
message_count = 21.0
messages = ['308537', '308570', '308580', '308610', '308611', '308623', '308641', '308642', '308644', '308679', '308680', '308682', '308683', '308695', '308701', '308703', '308722', '308730', '308731', '308743', '308745']
nosy_count = 3.0
nosy_names = ['r.david.murray', 'levkivskyi', 'Camion']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32361'
versions = ['Python 3.6']