كيفية العثور على معرفات الوسوم لإضافة وسوم عند إنشاء موضوع عبر 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'