Have os.PathLike inherit from typing.Protocol

[brettcannon]

BPO	38885
Nosy	@brettcannon

^{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 2019-11-21.19:50:07.710>
created_at = <Date 2019-11-21.19:49:42.040>
labels = ['library', '3.9']
title = 'Have os.PathLike inherit from typing.Protocol'
updated_at = <Date 2019-11-21.19:50:07.708>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2019-11-21.19:50:07.708>
actor = 'brett.cannon'
assignee = 'none'
closed = True
closed_date = <Date 2019-11-21.19:50:07.710>
closer = 'brett.cannon'
components = ['Library (Lib)']
creation = <Date 2019-11-21.19:49:42.040>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 38885
keywords = []
message_count = 2.0
messages = ['357206', '357207']
nosy_count = 1.0
nosy_names = ['brett.cannon']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38885'
versions = ['Python 3.9']

[brettcannon]

Since os.PathLike explicitly defines a a protocol, it would make sense to have it inherit from typing.Protocol instead of abc.ABC.

[brettcannon]

Closing as importing 'typing' in 'os' is probably too much and would impact start-up time.