Empty hash in handleCallback in OAuth2 scheme

[odyniec]

In line 358 of oauth2.ts, it looks like getQuery() can't parse route.hash. The resulting hash is an empty object. It seems getQuery() only parses queries starting with ?, as I was able to check with a simple test:

const query1 = "?foo=bar&baz=xyzzy"
console.log(getQuery(query1)) // { foo: 'bar', baz: 'xyzzy' }
console.log(getQuery(query1.slice(1))) // {}

const query2 = "#foo=bar&baz=xyzzy"
console.log(getQuery(query2)) // {}
console.log(getQuery(query2.slice(1))) // {}

parseQuery() on the other hand seems to work -- so maybe oauth2.ts just needs the same treatment as openIDConnect.ts got here?