Thanks for the encouragement! Another author here. Yes, if you are interested you can check our another blog [1] for the internal storage engine. Yes, we are limiting the delimeter to "/", to better support posix FS semantics. I have just finished the fs feature branch which has passed all posix fstests [2].

[1] https://fractalbits.com/blog/metadata-engine-for-our-object-...

[2] https://github.com/pjd/pjdfstest