author_cakeday=false returns no results

[dmarx]

http://api.pushshift.io/reddit/submission/search/?after=1d&author_cakeday=false

The changelog lists author_cakeday as a boolean parameter. The behavior I'm observing is that it either takes the value "true" or nothing at all. Is this how all the boolean parameters behavior, or is something funny going on here specifically?

Also, FYI: this parameter doesn't appear in the api documentation