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// The argument to Set can be a generator.
function* hexData(n) {
for (var i = 0; i < n; i++)
yield i.toString(16);
}
var s = new Set(hexData(256));
assertEq(s.size, 256);
assertEq(s.has("0"), true);
assertEq(s.has(0), false);
assertEq(s.has("ff"), true);