`pathlib.Path.touch()` calls `os.close()` without using accessor

[barneygale]

BPO	39895
Nosy	@zooba, @barneygale
PRs	bpo-39895: Move pathlib.Path.touch() implementation into the path accessor #18838

^{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 2021-04-07.11:36:08.566>
created_at = <Date 2020-03-08.03:52:39.637>
labels = ['library', '3.10']
title = '`pathlib.Path.touch()` calls `os.close()` without using accessor'
updated_at = <Date 2021-04-07.11:36:08.565>
user = 'https://github.com/barneygale'

bugs.python.org fields:

activity = <Date 2021-04-07.11:36:08.565>
actor = 'steve.dower'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-07.11:36:08.566>
closer = 'steve.dower'
components = ['Library (Lib)']
creation = <Date 2020-03-08.03:52:39.637>
creator = 'barneygale'
dependencies = []
files = []
hgrepos = []
issue_num = 39895
keywords = ['patch']
message_count = 2.0
messages = ['363631', '390390']
nosy_count = 2.0
nosy_names = ['steve.dower', 'barneygale']
pr_nums = ['18838']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39895'
versions = ['Python 3.10']

[barneygale]

Path.touch() does a lot of os-specific /stuff/ that should probably live in the accessor. Perhaps most importantly, is calls os.close() on whatever accessor.open() returns, which is problematic for those wishing to write their own accessor that doesn't work on a file descriptor level.

[zooba]

New changeset 986da8e by Barney Gale in branch 'master':
bpo-39895: Move pathlib.Path.touch() implementation into the path accessor. (GH-18838)
986da8e