after creating an instance of memcache store, I can't choose it for session in the form /cache/admin.php?action=editmodemapping.

in /cache/forms.php when preparing options for the 3 select box (application, session and request) , I found a new condition that prevent session to be applied to memcache store :
if ($enabled && ($mode !== cache_store::MODE_SESSION || $store['supports']['searchable'])) {
instead of only if ($enabled) {

Is it normal or is it a regression bug?

Does memcache store really can be applied on session ?