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A couple of random eyebrow-raisers I noticed while working on v2:
- sqlite3.Warning is a subclass of Exception, rather than sqlite3.Error
 or builtins.Warning. (Also, the docs say "will raise a Warning",
 intending to refer to sqlite3.Warning, but the lack of markup makes
 this ambiguous --- it would be interpreted as a reference to
 builtins.Warning).
- If _PyUnicode_AsStringAndSize() returns NULL, the code sets a
 sqlite3.Warning exception without first checking what exception is
 already set. (grep for PYSQLITE_SQL_WRONG_TYPE)