SpooledTemporaryFile.__iter__ is not transparent to rollover

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-01-08.14:46:35.069>
labels = ['type-bug', 'library', '3.10']
title = 'SpooledTemporaryFile.__iter__ is not transparent to rollover'
updated_at = <Date 2021-01-08.14:46:35.069>
user = 'https://bugs.python.org/jinohkangkr'

bugs.python.org fields:

activity = <Date 2021-01-08.14:46:35.069>
actor = 'jinoh.kang.kr'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-01-08.14:46:35.069>
creator = 'jinoh.kang.kr'
dependencies = []
files = []
hgrepos = []
issue_num = 42868
keywords = []
message_count = 1.0
messages = ['384674']
nosy_count = 1.0
nosy_names = ['jinoh.kang.kr']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42868'
versions = ['Python 3.10']