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Removing not null constraint doesn't behave correctly
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... Or, even better, I'll fix the [PRAGMA schema_version][1] command so that
it works as advertised in the ALTER TABLE documentation.  That has now been
done.

Please try again using the latest [prerelease snapshot][2] and let me know
if it is now working better for you.

[1]: https://www.sqlite.org/pragma.html#pragma_schema_version
[2]: https://www.sqlite.org/download.html