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'use strict';

// do not edit .js files directly - edit src/index.jst

var envHasBigInt64Array = typeof BigInt64Array !== 'undefined';

module.exports = function equal(a, b) {
  if (a === b) return true;

if (a && b && typeof a == 'object' && typeof b == 'object') {
    if (a.constructor !== b.constructor) return false;

var length, i, keys;
    if (Array.isArray(a)) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;)
        if (!equal(a[i], b[i])) return false;
      return true;
    }

if ((a instanceof Map) && (b instanceof Map)) {
      if (a.size !== b.size) return false;
      for (i of a.entries())
        if (!b.has(i[0])) return false;
      for (i of a.entries())
        if (!equal(i[1], b.get(i[0]))) return false;
      return true;
    }

if ((a instanceof Set) && (b instanceof Set)) {
      if (a.size !== b.size) return false;
      for (i of a.entries())
        if (!b.has(i[0])) return false;
      return true;
    }

if (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;)
        if (a[i] !== b[i]) return false;
      return true;
    }

if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();

keys = Object.keys(a);
    length = keys.length;
    if (length !== Object.keys(b).length) return false;

for (i = length; i-- !== 0;)
      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;

for (i = length; i-- !== 0;) {
      var key = keys[i];

if (!equal(a[key], b[key])) return false;
    }

return true;
  }

// true if both NaN, false otherwise
  return a!==a && b!==b;
};