Should we have an ArgEnum::from_os_str?

[epage]

Enum variants are statically known and we control the parser. If we derive from_os_str and use that, it will bypass needing to do UTF-8 validation.

Unsure if we'd get value out of doing similar for subcommands because of how they are parsed.

[pksunkara]

Are you suggesting to replace from_str with from_os_str?

[epage]

I can see providing both still but having arg_enum processing use from_os_str.