[Rust] A minimalistic, (essentially) POSIX-compliant option parser (https://crates.io/crates/getopt)
#3Support "+" as an additional option delimiter
The Single Unix Standard mandates for the ex(1) and vi(1) commands (and perhaps others): "that '+' may be recognized as an option delimiter as well as '-'".
The difficult part will be providing this functionality without mangling the existing interface too badly.
