[issue42064] Convert sqlite3 to multi-phase initialisation (PEP 489)

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

I've narrowed down the traverse problems to Py_VISIT(state->CacheType). Suspecting this has to do with the cyclic references in cache/connection. Preliminary tests with GC tracking `cache->factory` look promising, but this is a part of the C API that's _completely_ unknown to me (yet), so I'm on thin ice here.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42064>
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