Hi, Can we reconsider exporting PhoneNumber class given: * The typescript types we export says we export a class, but isn't really the case. ``` import { PhoneNumber } from "libphonenumber-js"; // typechecks but crashes in runtime since PhoneNumber is undefined console.log("foo" instanceof PhoneNumber); ``` * We already export other classes such as `PhoneNumberMatcher`, `AsYouType`, etc. * The workaround when this was last visited at #65 no longer works since we define an "exports" within the package. Should we prefer not to export the class, it might be best to change the `PhoneNumber` type export to an interface instead.