It seems to me that the default SQLite threaded mode (serialized, SQLITE_THEADSAFE=1) actually implies DB-API 2.0 threadsafety=3, because the module, connections, and cursors (prepared statements) can be shared. SQLITE_THREADSAFE=2 (multi-thread mode) implies DB-API 2.0 threadsafety=1, and SQLITE_THREADSAFE=0 (single-thread mode) implies DB-API 2.0 threadsafety=0.
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