Support operating on bytes

[epage]

I'm experimenting with handling completions completely in clap_complete, like python's argcomplete. As an input, I'm getting COMP_LINE which is an environment variable containing the line being parsed, ie an OsStr. I'm wanting to be able to handle non-unicode paths which means I can't operate on OsStr::to_str but need to convert to the raw bytes via os_str_bytes. It looks like shlex operates on bytes internally but doesn't offer a constructor or outputs that stay within bytes.

If you are open to this, I'd be willing to implement support for it.

[fenhl]

This sounds like a reasonable addition.

[epage]

FYI I found I could implement completions in a different way which also saves a lot on complexity, so this is no longer a blocker for me. Its unclear if this new strategy will work universally and I won't ever need this or if I might end up needing this eventually.