session.cache_limiter empty string?

Hi, I am trying to understand php_session_cache_limiter but my knowledge is, well, limited :) Setting session.cache_limiter to an empty string doesn't send headers. Is this just an artefact of if (!strcasecmp(lim->name, PS(cache_limiter))) not matching the empty string or does if (PS(cache_limiter)[0] == '\0') return 0; deliberately stop it? Ie. what should I add to the documentation for people who don't want PHP to send anything? Thanks Karoly Negyesi