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/unit/ParametersTest.php

@@ -63,7 +63,7 @@ class ParametersTest extends TestCase
     {
         try {
             Configuration::$mode = Mode::SQLite;
-            $this->assertEquals([':it0' => 'test', ':it1' => 'unit', ':it2' => 'wow'],
+            $this->assertEquals([':it0' => '$.test', ':it1' => '$.unit', ':it2' => '$.wow'],
                 Parameters::fieldNames(':it', ['test', 'unit', 'wow']), 'Field name parameters not correct');
         } finally {
             Configuration::$mode = null;