Finish tests

- Add sub-doc handling for SQLite fields
- Add casting for PostgreSQL BT on numeric value
- Add hasItems() to DocumentList
- Fix SQL syntax problems exposed by tests

tests/integration/sqlite/PatchTest.php

@@ -10,6 +10,7 @@ use Test\Integration\TestDocument;
 /**
  * SQLite integration tests for the Patch class
  */
+#[TestDox('Patch (SQLite integration)')]
 class PatchTest extends TestCase
 {
     /** @var string Database name for throwaway database */