function equalsIgnoreCase() {
  var unique = [];

  for (var _len = arguments.length, strings = new Array(_len), _key = 0; _key < _len; _key++) {
    strings[_key] = arguments[_key];
  }

  var length = strings.length;

  while (length) {
    length -= 1;
    var string = (0, _mixed.stringify)(strings[length]).toLowerCase();

    if (unique.indexOf(string) === -1) {
      unique.push(string);
    }
  }

  return unique.length === 1;
}
Compare strings case insensitively.

@param {...String} strings Strings to compare.
@returns {Boolean}