Description:
------------
The SQLite3Result::columnType() method returns SQLITE3_NULL (5) if not looping over results.  This is done because the data type is unknown.  But this leads to confusion, because SQLITE3_NULL is a legitimate answer in some cases when inside the loop.  It would be clearer if PHP returned NULL or FALSE instead.


Test script:
---------------
$db = new SQLite3(':memory:');

$db->exec('CREATE TABLE test (whatever INTEGER)');
$db->exec('INSERT INTO test (whatever) VALUES (1)');

$result = $db->query('SELECT * FROM test');
while ($row = $result->fetchArray(SQLITE3_NUM)) {
    var_dump($result->columnType(0));  // int(1)  [SQLITE3_INTEGER]
}

// Seems returning null or false is more appropriate.
var_dump($result->columnType(0));  // int(5)  [SQLITE3_NULL]

$result->finalize();
$db->close();

echo "Done\n";


Expected result:
----------------
int(1)
bool(false)
Done


Actual result:
--------------
int(1)
int(5)
Done