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// Arrow functions have a .length property like ordinary functions.
assertEq((a => a).hasOwnProperty("length"), true);
assertEq((a => a).length, 1);
assertEq((() => 0).length, 0);
assertEq(((a) => 0).length, 1);
assertEq(((a, b) => 0).length, 2);
assertEq(((...arr) => arr).length, 0);
assertEq(((a=1, b=2) => 0).length, 0);