@ungap/is-array/index.js

An is-array polyfill for legacy browsers.

var isArray = Array.isArray || /* istanbul ignore next */ (function (toString) {
  /* istanbul ignore next */
  var $ = toString.call([]);
  /* istanbul ignore next */
  return function isArray(object) {
    return toString.call(object) === $;
  };
}({}.toString));