Deprecate `typing.io` Wrapper Namespace

[rohitkg98]

BPO	42001
Nosy	@gvanrossum, @srittau, @ilevkivskyi, @JelleZijlstra, @rohitkg98

^{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 2021-05-02.20:36:57.289>
created_at = <Date 2020-10-10.19:02:51.396>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.7', 'library']
title = 'Deprecate `typing.io` Wrapper Namespace'
updated_at = <Date 2021-05-02.20:36:57.288>
user = 'https://github.com/rohitkg98'

bugs.python.org fields:

activity = <Date 2021-05-02.20:36:57.288>
actor = 'JelleZijlstra'
assignee = 'none'
closed = True
closed_date = <Date 2021-05-02.20:36:57.289>
closer = 'JelleZijlstra'
components = ['Library (Lib)']
creation = <Date 2020-10-10.19:02:51.396>
creator = 'rohitkg98'
dependencies = []
files = []
hgrepos = []
issue_num = 42001
keywords = []
message_count = 3.0
messages = ['378412', '378414', '392729']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'srittau', 'levkivskyi', 'JelleZijlstra', 'rohitkg98']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42001'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[rohitkg98]

The typing module has a wrapper namespace in it called typing.io which contain I/O stream types.

These types are now a part of the typing module itself.

While we are at it, should we also deprecate typing.re?

[srittau]

For reference, this came up in python/typeshed#4639 (comment). typing.io has never been in typeshed and we decided not to include it. It looks as if it never gained any traction, especially since the types are available from typing directly.

[JelleZijlstra]

Closing as a duplicate of https://bugs.python.org/issue38291