If you ask for the API help for the pageterms query module, e.g.
note the help for wbptterms is "The kinds of terms to get, e.g. 'label', 'description', or 'alias'."
- There's no mention that if you don't specify this, you get all of them.
- The API should list the valid values, not just give some examples.. Assuming it's not overrideable, the valid values are TYPE_ALIAS, TYPE_DESCRIPTION, TYPE_LABEL, and the API should return these.