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// Setting a Map key to undefined, or a missing argument, isn't the same as deleting it. var m = new Map; m.set(42, undefined); assertEq(m.has(42), true); assertEq(m.get(42), undefined); m.set(42, "wrong"); m.set(42); assertEq(m.has(42), true); assertEq(m.get(42), undefined); m.set(); assertEq(m.has(undefined), true); assertEq(m.get(undefined), undefined); |