Signature.from_callable sometimes drops subclassing #78887
Description
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = 'https://github.com/gpshead'
closed_at = <Date 2020-10-10.01:37:03.831>
created_at = <Date 2018-09-16.21:12:01.624>
labels = ['3.7', '3.8', 'type-bug', 'library', '3.9']
title = 'Signature.from_callable sometimes drops subclassing'
updated_at = <Date 2020-10-10.01:37:03.830>
user = 'https://github.com/bukzor'bugs.python.org fields:
activity = <Date 2020-10-10.01:37:03.830>
actor = 'gregory.p.smith'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2020-10-10.01:37:03.831>
closer = 'gregory.p.smith'
components = ['Library (Lib)']
creation = <Date 2018-09-16.21:12:01.624>
creator = 'bukzor'
dependencies = []
files = []
hgrepos = []
issue_num = 34706
keywords = ['patch']
message_count = 5.0
messages = ['325501', '352357', '352382', '352383', '378354']
nosy_count = 4.0
nosy_names = ['gregory.p.smith', 'bukzor', 'matrixise', 'iritkatriel']
pr_nums = ['9344', '16108', '16113', '16114']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34706'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']