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F5: Off Canvas fires Reveal 'open' Method

I have discovered that opening Off Canvas also fires the Reveal Modal 'open' Method. Is this a bug?

$(document).foundation({
    reveal: {
		open: function() {    // THIS GETS FIRED BY OFF CANVAS !? //

			$(document.body).addClass("reveal-modal-active");
		},
		close: function () {
			$(document.body).removeClass("reveal-modal-active");
		}
	}
});

reveal modaloff canvas

I have discovered that opening Off Canvas also fires the Reveal Modal 'open' Method. Is this a bug?

$(document).foundation({
    reveal: {
		open: function() {    // THIS GETS FIRED BY OFF CANVAS !? //

			$(document.body).addClass("reveal-modal-active");
		},
		close: function () {
			$(document.body).removeClass("reveal-modal-active");
		}
	}
});