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'use strict';
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// do not edit .js files directly - edit src/index.jst
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module.exports = function equal(a, b) {
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  if (a === b) return true;
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  if (a && b && typeof a == 'object' && typeof b == 'object') {
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    if (a.constructor !== b.constructor) return false;
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    var length, i, keys;
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    if (Array.isArray(a)) {
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      length = a.length;
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      if (length != b.length) return false;
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      for (i = length; i-- !== 0;)
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        if (!equal(a[i], b[i])) return false;
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      return true;
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    }
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    if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
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    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
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    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
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    keys = Object.keys(a);
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    length = keys.length;
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    if (length !== Object.keys(b).length) return false;
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    for (i = length; i-- !== 0;)
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      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
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    for (i = length; i-- !== 0;) {
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      var key = keys[i];
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      if (!equal(a[key], b[key])) return false;
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    }
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    return true;
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  }
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  // true if both NaN, false otherwise
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  return a!==a && b!==b;
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};