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Purpose of this module is little bit hard to understand. Indeed, in the previous version of ocaml-git, we used Fpath to have a good abstraction of path in UNIX and Windows systems. However, Git keeps in some ways (INDEX file specially) the UNIX path semantic (tree and reference use it too). So, Path is an abstraction (Git-path) to keep UNIX path semantic (and the separator "/"). However, we used it in few cases.
Indeed, any interation with a FS use an Fpath and Path is used only when we talk with the Git kernel (for example, the S.fold function). The biggest differences between Fpath and Path is:
The empty element, that means, any Path __is__ (must be) relative with a Fpath.
The UNIX separator in any platform, so we need to cast a Path to an Fpath then when we want to talk with the FS.
It's really annoying to handle it like this but Windows is a shit.