1  var baseIsEqualDeep = require('./_baseIsEqualDeep'),
 2      isObjectLike = require('./isObjectLike');
 3  
 4  /**
 5   * The base implementation of `_.isEqual` which supports partial comparisons
 6   * and tracks traversed objects.
 7   *
 8   * @private
 9   * @param {*} value The value to compare.
10   * @param {*} other The other value to compare.
11   * @param {boolean} bitmask The bitmask flags.
12   *  1 - Unordered comparison
13   *  2 - Partial comparison
14   * @param {Function} [customizer] The function to customize comparisons.
15   * @param {Object} [stack] Tracks traversed `value` and `other` objects.
16   * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
17   */
18  function baseIsEqual(value, other, bitmask, customizer, stack) {
19    if (value === other) {
20      return true;
21    }
22    if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
23      return value !== value && other !== other;
24    }
25    return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
26  }
27  
28  module.exports = baseIsEqual;