pty.spawn: inconsistent interface

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-07-26.23:54:56.777>
labels = ['3.7', 'type-feature', 'library']
title = 'pty.spawn: inconsistent interface'
updated_at = <Date 2018-07-26.23:54:56.777>
user = 'https://bugs.python.org/Arden'

bugs.python.org fields:

activity = <Date 2018-07-26.23:54:56.777>
actor = 'Arden'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-07-26.23:54:56.777>
creator = 'Arden'
dependencies = []
files = []
hgrepos = []
issue_num = 34243
keywords = []
message_count = 1.0
messages = ['322452']
nosy_count = 1.0
nosy_names = ['Arden']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue34243'
versions = ['Python 3.7']