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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<https://bugs.python.org/issue27861>
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