Maybe have a compression setting?

[typecasto]

We could look for each n bytes in pi, thereby making it take exponentially longer, but it would enable much better compression.

Maybe we could also do multiple passes, storing the metadata in pi as well, with a higher compression setting, and so on and so forth.

It'd also be really nice to implement a separate compression tool, rather than a filesystem, like zip, so that we could compress single files.