Incorrect __text_signature__ for the __get__ slot wrapper

[mr-nfamous]

BPO	35979
Nosy	@mr-nfamous

^{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 = None
closed_at = <Date 2019-02-13.07:55:55.904>
created_at = <Date 2019-02-13.00:42:47.016>
labels = ['type-bug', 'invalid']
title = 'Incorrect __text_signature__ for the __get__ slot wrapper'
updated_at = <Date 2019-02-13.07:55:55.902>
user = 'https://github.com/mr-nfamous'

bugs.python.org fields:

activity = <Date 2019-02-13.07:55:55.902>
actor = 'SilentGhost'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-13.07:55:55.904>
closer = 'SilentGhost'
components = []
creation = <Date 2019-02-13.00:42:47.016>
creator = 'bup'
dependencies = []
files = []
hgrepos = []
issue_num = 35979
keywords = []
message_count = 2.0
messages = ['335378', '335393']
nosy_count = 2.0
nosy_names = ['SilentGhost', 'bup']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35979'
versions = []

[mr-nfamous]

The current signature:

"__get__($self, instance, owner, /)\n--\n\nReturn an attribute of instance, which is of type owner."

doens't match how wrap_descr_get actually parses the arguments to __get__ with:

    PyArg_UnpackTuple(args, "", 1, 2, &obj, &type)

[SilentGhost]

Is it not? This seems to be doing exactly what's intended. If you have a reproducible bug trigger, please post it, but I'll close the issue in the meantime.