Deprecate returning a subclass of complex from __complex__

[serhiy-storchaka]

BPO	29894
Nosy	@mdickinson, @serhiy-storchaka
PRs	bpo-29894: Deprecate returning an instance of complex subclass from __complex__ #798

^{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 2017-03-27.18:06:06.242>
created_at = <Date 2017-03-24.08:27:24.474>
labels = ['interpreter-core', 'type-feature', '3.7']
title = 'Deprecate returning a subclass of complex from __complex__'
updated_at = <Date 2017-03-27.18:06:06.241>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2017-03-27.18:06:06.241>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2017-03-27.18:06:06.242>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2017-03-24.08:27:24.474>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 29894
keywords = []
message_count = 2.0
messages = ['290080', '290108']
nosy_count = 2.0
nosy_names = ['mark.dickinson', 'serhiy.storchaka']
pr_nums = ['798']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29894'
versions = ['Python 3.7']

[serhiy-storchaka]

This is similar to bpo-26983, but complex() always returned exact complex. A deprecation warning is added just for uniformity with __float__ and __int__.

[serhiy-storchaka]

New changeset 671079e by Serhiy Storchaka in branch 'master':
bpo-29894: Deprecate returning an instance of complex subclass from __complex__. (#798)
671079e