Open up UnderlyingType to the public API

[JohnnyCrazy]

Is your feature request related to a problem? Please describe.

I'm currently trying to write a proof of concept for auto-generating ZSH/Bash Completions for a CommandLineApplication. Since completions are able to provide values for arguments/options, it would be great if I could support enum options/arguments and put those values into the completion list. However, right now I'm not able to continue because I'm unable to access UnderlyingType, which was introduced in #276 .

Describe the solution you'd like

I think the straight forward and simple solution would be changing internal UnderylingType to public UnderylingType 😄

Describe alternatives you've considered

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Additional context

I'm happy to provide a PR if you're comfortable with my proposed solution 👍

[natemcmaster]

When that API was added, I intentionally left it internal because I was hoping to find time to do a refactor that would eliminate the need for it to exist. I haven't got around to that refactor yet, but with winter coming soon and rainy Seattle days keeping me inside, I might pick up that refactor again.

Are there alternatives to solve your problem that don't require exposing this API as public?

[JohnnyCrazy]

Mh, I think for my usecase (Generating auto-complete scripts for ZSH/Bash), it would be nice to have, but not mandatory. I already got a basic setup working without access to UnderlyingType here, which hopefully gets it's own package at some point.

The only thing which I can't support right now is auto-suggesting enum values, since I would need access to the type.

[natemcmaster]

So, it sounds like your use case is that you need to determine acceptable values, and accessing UnderlyingType is one way to do that. I think there are alternatives which may work better. For example, what if CommandOption had and API like ICollection<string> AllowedValues? Would that satisfy your requirements for auto-complete generation?

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