function isEqualWith(value, other, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      var result = customizer ? customizer(value, other) : undefined;
      return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
    }
This method is like `_.isEqual` except that it accepts `customizer` which
is invoked to compare values. If `customizer` returns `undefined`, comparisons
are handled by the method instead. The `customizer` is invoked with up to
six arguments: (objValue, othValue [, index|key, object, other, stack]).

@static
@memberOf _
@since 4.0.0
@category Lang
@param {*} value The value to compare.
@param {*} other The other value to compare.
@param {Function} [customizer] The function to customize comparisons.
@returns {boolean} Returns `true` if the values are equivalent, else `false`.
@example

function isGreeting(value) {
  return /^h(?:i|ello)$/.test(value);
}

function customizer(objValue, othValue) {
  if (isGreeting(objValue) && isGreeting(othValue)) {
    return true;
  }
}

var array = ['hello', 'goodbye'];
var other = ['hi', 'goodbye'];

_.isEqualWith(array, other, customizer);
// => true