Bug in PDO driver class?

[eluser]musonic[/eluser]
I tried using the new PDO driver that is included with CI 2.1.0. It didn't go well. It was unable to create a connection. I think I tracked down the problem and fixed it, but I never like adding (or removing) anything from the core.
The problem seemed to be when instantiating a new PDO instance. On line 114 of pro_driver.php we have:

Code:

return new PDO($this->hostname, $this->username, $this->password, $this->options);

The problem is that

Code:

$this->hostname

is incorrect. In my case this is currently just localhost.
Currently it is set on line 81:

Code:

$this->hostname .= ";dbname=".$this->database;

The problem is that it is missing the first bit of the string that PDO needs. Immediately before line 81 I have added

Code:

$this->hostname = 'mysql:host='.$this->hostname;

This builds the correct string and I can now connect as expected. Of course the problem with this fix is that I've hardcoded mysql...