duplicated signature of dataclass in help()

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-07-28.04:39:59.072>
labels = ['type-bug', 'library', '3.10']
title = 'duplicated signature of dataclass in help()'
updated_at = <Date 2020-07-28.04:41:25.198>
user = 'https://github.com/sir-sigurd'

bugs.python.org fields:

activity = <Date 2020-07-28.04:41:25.198>
actor = 'sir-sigurd'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-07-28.04:39:59.072>
creator = 'sir-sigurd'
dependencies = []
files = []
hgrepos = []
issue_num = 41415
keywords = ['patch']
message_count = 1.0
messages = ['374461']
nosy_count = 1.0
nosy_names = ['sir-sigurd']
pr_nums = ['21652']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41415'
versions = ['Python 3.10']