Comment trouver les IDs de tags pour ajouter des tags lors de la création d'un sujet via l'API

Does anyone know if this should work in 2.0.0.beta9? Tags are not mentioned in the API docs for POST /posts.
I tried to create topics with tags="testtag" but got a HTTP 500 error.

From the logs:

NoMethodError (undefined method `-' for "testtag":String)                                                                                                                                                                                       
/var/www/discourse/lib/discourse_tagging.rb:220:in `tags_for_saving'