ZF-2997: filtername on Zend_Form_Element is typed wrongly

Description

Line 421 of Zend_Form_Element: $name = $this->filtername($name);

Should be rather: $name = $this->filterName($name);

Comments

Please evaluate and categorize as necessary.

Scheduling for next mini release. This is not a critical fix, as PHP interprets function names in a case insensitive manner, and both examples work.

Updated in trunk and 1.5 release branch as of r9377.