Get rid of cyclic GC hack in sqlite3.Connection and sqlite3.Cache

[erlend-aasland]

BPO	42213
Nosy	@vstinner, @berkerpeksag, @miss-islington, @erlend-aasland
PRs	[WIP] bpo-42213: Support cyclic garbage collection in sqlite3 #23046 bpo-42213: Remove redundant cyclic GC hack in sqlite3 #26462 bpo-42213: Check connection in sqlite3.Connection.__enter__ #26512 bpo-42213: Remove redundant cyclic GC hack in sqlite3 #26517

^{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 2021-06-04.19:58:08.351>
created_at = <Date 2020-10-30.21:44:11.228>
labels = ['library', '3.10', 'performance']
title = 'Get rid of cyclic GC hack in sqlite3.Connection and sqlite3.Cache'
updated_at = <Date 2021-06-07.21:30:06.136>
user = 'https://github.com/erlend-aasland'

bugs.python.org fields:

activity = <Date 2021-06-07.21:30:06.136>
actor = 'erlendaasland'
assignee = 'none'
closed = True
closed_date = <Date 2021-06-04.19:58:08.351>
closer = 'erlendaasland'
components = ['Library (Lib)']
creation = <Date 2020-10-30.21:44:11.228>
creator = 'erlendaasland'
dependencies = []
files = []
hgrepos = []
issue_num = 42213
keywords = ['patch']
message_count = 5.0
messages = ['379998', '395009', '395016', '395288', '395289']
nosy_count = 4.0
nosy_names = ['vstinner', 'berker.peksag', 'miss-islington', 'erlendaasland']
pr_nums = ['23046', '26462', '26512', '26517']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue42213'
versions = ['Python 3.10']

[erlend-aasland]

Get rid of the pysqlite_Cache->decref_factory hack by implementing proper support for cyclic garbage collection.

[vstinner]

New changeset 82ad22a by Erlend Egeberg Aasland in branch 'main':
bpo-42213: Check connection in sqlite3.Connection.__enter__ (GH-26512)
82ad22a

[miss-islington]

New changeset d88b47b by Erlend Egeberg Aasland in branch 'main':
bpo-42213: Remove redundant cyclic GC hack in sqlite3 (GH-26517)
d88b47b

[vstinner]

I like the new code, thanks for these enhancements Erlend ;-)

[erlend-aasland]

Thanks, Victor :)