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// |reftest| skip-if(!this.hasOwnProperty("Tuple"))
let dda = createIsHTMLDDA();
assertEq(dda == null, true);
assertEq(dda === null, false);
assertEq(dda == undefined, true);
assertEq(dda === undefined, false);
let tup = Tuple("A", "B");
assertEq(tup.join(null), "A,B");
assertEq(tup.join(undefined), "A,B");
assertEq(tup.join(dda), "A" + dda.toString() + "B");
if (typeof reportCompare === "function")
reportCompare(0, 0);