AsyncMock force always creating an AsyncMock for child mocks

GitHub fields:

assignee = 'https://github.com/lisroach'
closed_at = None
created_at = <Date 2019-09-11.17:24:54.683>
labels = ['type-bug', 'library']
title = 'AsyncMock force always creating an AsyncMock for child mocks'
updated_at = <Date 2019-10-28.20:47:37.252>
user = 'https://github.com/lisroach'

bugs.python.org fields:

activity = <Date 2019-10-28.20:47:37.252>
actor = 'pconnell'
assignee = 'lisroach'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-09-11.17:24:54.683>
creator = 'lisroach'
dependencies = []
files = []
hgrepos = []
issue_num = 38122
keywords = ['patch']
message_count = 4.0
messages = ['351991', '352000', '352101', '352360']
nosy_count = 7.0
nosy_names = ['cjw296', 'ezio.melotti', 'michael.foord', 'pconnell', 'matrixise', 'lisroach', 'xtreak']
pr_nums = ['16099', '16137']
priority = 'low'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38122'
versions = []