ForEach and checkboxes?

Hello,
I use ToscaWidgets but I believe this is more of a FormEncode problem:
In my form schema I use myfield = FormFieldRepeater(widget=Checkbox,  
repetitions=3). FormFieldRepeater uses the ForEach validator which in  
my case returns [True] instead of [False, False, True] if only the  
last checkbox is checked. I think the problem is already in schema.py  
where a method simply returns validator.if_missing value which may be  
ok for normal input fields but not checkboxes. Maybe  
ForEach.if_missing shouldn't simply a value of [].
Is there any workaround for what I want?
thanks,
matej

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