function deepEqual(actual, expected, options) {
  var opts = options || {};

  // 7.1. All identical values are equivalent, as determined by ===.
  if (opts.strict ? is(actual, expected) : actual === expected) {
    return true;
  }

  // 7.3. Other pairs that do not both pass typeof value == 'object', equivalence is determined by ==.
  if (!actual || !expected || (typeof actual !== 'object' && typeof expected !== 'object')) {
    return opts.strict ? is(actual, expected) : actual == expected;
  }

  /*
   * 7.4. For all other Object pairs, including Array objects, equivalence is
   * determined by having the same number of owned properties (as verified
   * with Object.prototype.hasOwnProperty.call), the same set of keys
   * (although not necessarily the same order), equivalent values for every
   * corresponding key, and an identical 'prototype' property. Note: this
   * accounts for both named and indexed properties on Arrays.
   */
  // eslint-disable-next-line no-use-before-define
  return objEquiv(actual, expected, opts);
}
Creates a copy of this word array.

@return {X64WordArray} The clone.

@example

    var clone = x64WordArray.clone();