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https://issues.apache.org/jira/browse/ISIS-431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13679443#comment-13679443
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Dan Haywood commented on ISIS-431:
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I think the deeper problem here is that our booleans are not tri-valued. We
might want to say that a boolean is explicitly specified as either false or
true... which means that its initial value must be "neither" so that we can
detect if it has been entered or not.
> A boolean atribute should never be mandatory
> --------------------------------------------
>
> Key: ISIS-431
> URL: https://issues.apache.org/jira/browse/ISIS-431
> Project: Isis
> Issue Type: Bug
> Components: Viewer: Wicket
> Affects Versions: viewer-wicket-2.0.0
> Reporter: Jeroen van der Wal
> Assignee: Dan Haywood
> Priority: Minor
>
> A boolean attribute only has two states and when the @Optional annotation is
> omitted and the boolean is set to false, eg the checkbox is empty, it's
> impossible to save the object.
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