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

[Erlend Egeberg Aasland]

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

FYI, rebased https://github.com/erlend-aasland/cpython/tree/bpo-42064/all onto master, added Petr Viktorin's _PyType_GetModuleByDef() for use in item 7 (module state). I still run into problems in item 8, but I haven't devoted much time for this yet:
Modules/gcmodule.c:116: gc_decref: Assertion "gc_get_refs(g) > 0" failed: refcount is too small
Enable tracemalloc to get the memory block allocation traceback

object address  : 0x7f861140c6b0
object refcount : 2
object type     : 0x109666678
object type name: type
object repr     : <class 'sqlite3.InterfaceError'>

Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed
Python runtime state: finalizing (tstate=0x7f8631409000)

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