Wheeler: Fixing Unix/Linux/POSIX Filenames

I can see the argument for non-printable filenames. However, you'd need to distinguish between generic non-printable filenames (ie: any character array that can be used as a filename), tokens used synonymously with filenames (ie: a short fixed-length ID that denotes the file, regardless of the logical name or logical directory) and hashes used synonymously with filenames (ie: a long fixed-length ID that serves the same role as a token but can be generated rather than looked up).

IMHO, the different roles all speak to different problems and all have their limitations outside of the problems they're meant for. The first step in finding a solution is to define the problem, but a filesystem solves a very wide range of problems, making a definition less clear-cut.