Specify your setup

Irrelevant

Describe the bug

According to the Documentation and the Typescript typings, OAuth2Server.authenticate expects options.scope, which is of type string[]. However, in authenticate-handler.js, this scope is passedd to parseScope [source], which expects scope to be a string:

 if (typeof requestedScope !== 'string') {
 throw new InvalidScopeError('Invalid parameter: `scope`');
 }

To Reproduce

Try to pass a scope-Array to authenticate

Expected behavior

No error thrown, but instead an error would be thrown if I wouldn't pass an array.