fix duplicate values in IE. fix #840
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@ -118,8 +118,8 @@ the specific language governing permissions and limitations under the Apache Lic
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if (a === b) return true;
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if (a === undefined || b === undefined) return false;
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if (a === null || b === null) return false;
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if (a.constructor === String) return a === b+'';
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if (b.constructor === String) return b === a+'';
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if (a.constructor === String) return a+'' === b+''; // IE requires a+'' instead of just a
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if (b.constructor === String) return b+'' === a+''; // IE requires b+'' instead of just b
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return false;
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}
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