ambiguous _max_size parameter in SpooledTemporaryFile

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-08-20.19:47:35.501>
labels = ['type-bug', '3.8', '3.9', '3.7', 'library', 'docs']
title = 'ambiguous _max_size parameter in SpooledTemporaryFile'
updated_at = <Date 2019-07-07.15:58:26.019>
user = 'https://bugs.python.org/jcc2220'

bugs.python.org fields:

activity = <Date 2019-07-07.15:58:26.019>
actor = 'lurchman'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation', 'Library (Lib)']
creation = <Date 2018-08-20.19:47:35.501>
creator = 'jcc2220'
dependencies = []
files = []
hgrepos = []
issue_num = 34446
keywords = []
message_count = 4.0
messages = ['323809', '323845', '323850', '347475']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'docs@python', 'lurchman', 'jcc2220']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34446'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']