Object doesn't support property or method 'includes' in IE #20
Description
My application stopped running in IE when trying to implement this middleware.
Appears it uses the includes() method, which is not supported in IE: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
Users needing to support IE should be polyfilling this.
FYI: for create-react-app users, a "import 'core-js/es7/array';" in your index.js should suffice as well.
Just leaving it here, unsure if this is something that should be fixed in the module or at least documented somewhere.