Don't re-append internal query bindings

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Fix test typo

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Remove extra Datatype extensions

Let's stick with the core and make it reliable. People can always cast
values before sending them to SQLite queries if they differ.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>