…. General docs cleanup.

…s when being decoded, make `Double` and `Float` accept integer values, use recommended APIs for translating between ByteBuffer and Data

… error handling. Make sure statements get finalized when errors occur. Use sqlite3_bind_blob64() and sqlite3_bind_text64() instead of the 32-bit ones. Simplify reading of blob data.

…dd set of async assertions. Make tests resilient against array index range violations. Handle blobs more sensibly instead of torturing Data. Get rid of lots of force-unwraps. Use "throws error" assertion instead of messy do/catch clauses. Avoid crashing if opening a DB fails. Use singleton thread pool and MTELG always.

…convenience methods. Factor out the `open()` implementation so the core part can be shared by the ELF and async versions. Don't leak sqlite3* handles if sqlite3_busy_handler() fails for some reason. Throw more specific errors from `open()`. Don't log at error level. Use the async version of NIOThreadPool.runIfActive() when possible.

…tion's async methods together.

…n_v2(), so there's no point in setting multithread mode as the default during compilation; use serialized as the default instead.

…reading mode.

…entation, plus omitting several APIs that aren't usable through this package anyway.

…y default (security hardening). Provide an initializer flag to override it if needed.

… 5.8 manifest

… SQLiteDatabase is Sendable.