Form validation doesn't work with arrays

[eluser]RS71[/eluser]
If I'm not mistaken this thread talks about it as well: http://ellislab.com/forums/viewthread/109826/

Lets say I has these fields:

Code:

<input type="checkbox" value="1" name="purpose[]" />
<input type="checkbox" value="2" name="purpose[]" />

I've set two rules for purpose[] - one is the required rule, the other is a custom callback that checks that the value is present in a array of possible values.

If I edit the name of the field to:

Code:

<input type="checkbox" value="1" name="purpose[abc]" />

or even change the value to "", the validation passes. It ignores the required rule and my custom callback.

Some mention changing the $cycles variable in the _execute function of the form validation library but I'd like to see a formal bug fix if possible. Thanks