Re-opening /dev/tty breaks readline

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-01-31.10:53:07.633>
labels = ['type-feature', 'library']
title = 'Re-opening /dev/tty breaks readline'
updated_at = <Date 2017-09-09.00:57:11.088>
user = 'https://bugs.python.org/silvioricardoc'

bugs.python.org fields:

activity = <Date 2017-09-09.00:57:11.088>
actor = 'martin.panter'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-01-31.10:53:07.633>
creator = 'silvioricardoc'
dependencies = []
files = []
hgrepos = []
issue_num = 29396
keywords = []
message_count = 4.0
messages = ['286521', '301519', '301574', '301757']
nosy_count = 2.0
nosy_names = ['silvioricardoc', 'martin.panter']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29396'
versions = ['Python 3.4']