Why does propel convert the float property to a string?

I just noticed that propel converts numeric values ​​to strings in the created setter methods. My problem is that since I use German, float values ​​are inserted with a semicolon instead of a period. For example: "3.5" leads to the string "3.5". I am using PostgreSQL, which obviously expects 3.5.

Version Information: In case it matters, I use: PHP 5.3.9, Propel 1.6 with Symfony 2.2.

Details:

The table definition is as follows:

<table name="account_entry">
    ...
    <column name="amount" type="decimal" size="12" scale="2" required="true" />
    ...
</table>

The generated setAmount () method is as follows:

public function setAmount($v)
{
    if ($v !== null && is_numeric($v)) {
        $v = (string) $v;
    }

    if ($this->amount !== $v) {
        $this->amount = $v;
        $this->modifiedColumns[] = AccountEntryPeer::AMOUNT;
    }


    return $this;
} // setAmount()

Saving an object results in a PostgreSQL error:

Invalid text representation: 7 ERROR: invalid input syntax for type numeric: "3,5"

, , . , float setAmount(). , float , .

, propel float ? - ?

, , :

setlocale(LC_ALL, 'en_US');
$ae->setAmount(3.5);
setlocale(LC_ALL, 'de_DE');