I notice the [Zotero documentation](https://www.zotero.org/support/kb/item_types_and_fields) provides an example "horror" for the `Genre` field. This field is mapped to CSL's `genre` variable which is described in the spec as "not used for topical descriptions or categories (e.g. 'adventure' for an adventure movie)". It seems that the two are contradictory to each other. What is the suitable value for the `Genre` field?