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/CountTest.php

@@ -3,8 +3,13 @@
 namespace Test\Integration\SQLite;
 
 use BitBadger\PDODocument\{Count, Field};
+use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * SQLite integration tests for the Count class
+ */
+#[TestDox('Count (SQLite integration)')]
 class CountTest extends TestCase
 {
     /** @var string Database name for throwaway database */