Serhiy Storchaka added the comment:
About the first bug. Checking that a factory is a subclass of sqlite3.Cursor is
not enough. I suppose that a subclass of sqlite3.Cursor with overridden __new__
could pass the check but cause a crash.
class BadCursor(sqlite3.Cursor):
def __new__(cls, conn):
return None
Docs should be changed as well as the code.
As for the second bug, please open a separate issue. This is more complex issue.
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