Limit search result by multiple locations

Hello !

suggests I can filter by location:

I see it’s as simple as f_space_facet=0%2FBlog. GET param. (why “/2” I wonder =)

so I’ve tried to specify it twice:

/Search?sort=score&sortOrder=desc&highlight=true&facet=true&r=1&f_type=DOCUMENT&f_locale=en&f_locale=&text=object&f_space_facet=0%2FNews.&f_space_facet=0%2FBlog.

But that doesn’t work, only last one is used.
Could someone please advise how can I specify more than one location ?

See https://jira.xwiki.org/browse/XWIKI-13548 .