Incorrect typecasting in some cases when select uses equal names

Description

public function testWithTypecastingEdgeCase(): void
{
    $this->dropTable('test');

    $db = $this->getSharedConnection();
    $db->createCommand()->createTable('test', [
        'id' => PseudoType::PK,
        'json_col' => ColumnBuilder::json(),
    ])->execute();
    $db->createCommand()->insert('test', ['json_col' => ['a' => 1, 'b' => 2]])->execute();

    $query = $db
        ->select([
            't1.id as json_col',
            't2.json_col',
        ])
        ->from('test t1')
        ->innerJoin('test t2', 't2.id = t1.id');

    $this->assertSame(['json_col' => '{"a":1,"b":2}'], $query->one());

     // Currently, `['json_col' => 0]` is here
    $this->assertSame(['json_col' => ['a' => 1, 'b' => 2]], $query->withTypecasting()->one());
}

Package version

2.0.0

PHP version

any

Use testWithTypecastingEdgeCase as the reproduction entry point, then trace withTypecasting() through the query result typecasting path for duplicate selected names. Run the database test suite containing this case and compare the two assertions for the aliased id and JSON column. Done means the untyped result remains the JSON string and the typed result preserves the expected associative array when both selections are named json_col.