Limit the key length so we avoid going over the transient name limit
Reduce key length down to 28 so that it also works on multisite
Merge branch 'key-length' into five-two-compat
Merge branch 'five-two-compat' of github.com:humanmade/Backdrop into five-two-compat
Hardcode the complete namespace as __NAMESPACE__ is null here
use call_user_func as $class::method() fatals on 5.2