ember.js - Ember Data json-api adapter with EmbeddedRecordsMixin -

i'm using ember 1.13.4 & ember data 1.13.5 ember cli. using default jsonapiadapter & serializer & noticed when use ds.embeddedrecordsmixin serializer although "included" key in payload "attributes" key contains null values & instead attributes appear @ root of payload. invalidates json-api format.

should mixin work json-api or should avoid it?

thanks.