BUG: CheckboxField's do not get saved properly

[Juanitou]

This bug (http://open.silverstripe.org/ticket/6288) has not been addressed yet.

[UndefinedOffset]

I managed to come up with a workaround for this in my module... it's ugly but it seems to work ok https://github.com/UndefinedOffset/silverstripe-advancedwidgeteditor/blob/fddabed6a1391a4ce5cecb96844d0981167793cf/code/extensions/AdvancedWidgetEditorInterface.php#L49-L59

[UndefinedOffset]

I stand corrected, turns out it's not working other than for the UI this method is causing the change not to be written to the database https://github.com/silverstripe/silverstripe-widgets/blob/master/code/model/Widget.php#L229. I've made a commit in a fork that seems to be a viable solution to the problem https://github.com/webbuilders-group/silverstripe-widgets/commit/025604971ceec27dd6cccc4dcd73c2c1fbc360b8