POST /v1/author/{author} and join

[jackdeguest]

Not really an issue, but maybe more a feature request.
I tried to use the POST method on this endpoint /v1/author/{author}, which worked, but when I created with it the payload {"join": "release"} in lieu of the equivalent query string for the GET method, it is ignored. It only works if I use a query string with either GET or POST.

I think it would be nice if the server used the JSON payload in the POST query.