Description:
------------
Hello.
With decimal option, it's not possible to check two 
differents float.
Users type either '42.42' or '42,42'. But it's not easy to 
force user to type one style of float.
How use decimal option with mutli parameters ?
But with separator flag how do you do difference ?
Example : '1,597,541.42' english style ?
'5 999 741,487' french style ?
'987412.42' user style ;)
'4870,42' user style ;)
'4, 454, 454. 42' other style.
It's not easy to determine the right way.
Thank you for your job.


Reproduce code:
---------------
<?php
//$_GET['test1'] = '42,42';
//$_GET['test2'] = '42.42';
$test1 = input_get(INPUT_GET, 'test1', FILTER_VALIDATE_FLOAT, array('decimal' => ','));
var_dump($test1);
$test2 = input_get(INPUT_GET, 'test2', FILTER_VALIDATE_FLOAT);
var_dump($test2);
$test1 = input_get(INPUT_GET, 'test1', FILTER_VALIDATE_FLOAT);
var_dump($test1);
$test2 = input_get(INPUT_GET, 'test2', FILTER_VALIDATE_FLOAT, array('decimal' => ','));
var_dump($test2);
?>


Expected result:
----------------
float(42.42);
float(42.42);
float(42.42);
float(42.42);


Actual result:
--------------
float(42.42);
float(42.42);
bool(false);
bool(false);