Add an interface for flag types that can provide default values #422
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A simple use case might be that you want a flag to have the value of
os.UserCacheDir()and don't want to replicate its logic and/or deal with per-platform structs.I suppose there's a chance that someone already has a type with this method signature which suddenly starts providing defaults. I think the chance is probably low, but there's no real way of avoiding that with Go's implicit interfaces.
Fixes #421