lilo and btrfs

Just installed -current. One can't boot directly kernel on btrfs with lilo For this one needs separate /boot partition with ext4 for example. Perhaps it will be OK to put such information somewhere. Default installer makes just impression as it does not matter at all what file system is used. I mean all following steps should work well for all supported file systems. Which in fact is not true. Step where lilo is being installed fails if /boot is on btrfs.