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[Constructor(DOMString type, optional ImageCaptureErrorEventInit imageCaptureErrorInitDict)] interface ImageCaptureErrorEvent : Event { readonly attribute ImageCaptureError imageCaptureError; }; How could imageCaptureError be non-null if imageCaptureErrorInitDict is optional? [1] https://bugzilla.mozilla.org/show_bug.cgi?id=916643#c21