Description:
------------
When selecting from a FLOAT column, PDO returns garbage instead of the right value.

Tested in PHP 5.1.2 and 5.1.6; both fail in similar ways.

Reproduce code:
---------------
<?php
	error_reporting(E_ALL);
	
	$db = new PDO("mysql:host=localhost;dbname=test", 'root', '', array());
	$db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
	
	$db->exec("CREATE TEMPORARY TABLE test ( num FLOAT NOT NULL)");
	$db->exec("INSERT INTO test VALUES (1.5)");
	$st = $db->query("SELECT * FROM test");
	$row = $st->fetch(PDO::FETCH_ASSOC);
	var_dump($row);
	
?>

Expected result:
----------------
array(1) {
  ["num"]=>
  string(12) "1.5"
}


Actual result:
--------------
array(1) {
  ["num"]=>
  string(12) "-2.87989e-05"
}

Also other incorrect values; it seems nondeterministic.