[fw-general] Cannot instantiate Zend_Filter_StringToLower with encoding param

[umpirsky]

Hi.

This code

$f = new Zend_Filter_StringToLower('UTF-8');

or

$f = new Zend_Filter_StringToLower(array('encoding' => 'UTF-8'));

gives :

Zend_Filter_Exception: The given encoding 'Array' is not supported by
mbstring
thrown in Zend\Filter\StringToLower.php on line 93

Same behavior i get in form when I pass

'filters' => array('StringTrim', array('StringToLower', 'UTF-8')), 

I use zf  VERSION = '1.10.0'

Any idea?
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