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Seems that "open" and "duration" aren't showing up in the doc for dijit/_WidgetBase:
I don’t understand. open and duration aren’t properties on _WidgetBase or any of its parents, so they don’t show up there. Where do you think these would be coming from?
OK. open and duration are showing up on dijit/Dialog just fine after some changes I made earlier this evening so let me know what you are experiencing.
Yup, it's working for me too, ignore this ticket.