code: func WithStrippedPrefix(p ...string) source.Option {
  	return func(o *source.Options) {
  		if o.Context == nil {
  			o.Context = context.Background()
  		}
  
  		o.Context = context.WithValue(o.Context, strippedPrefixKey{}, appendUnderscore(p))
  	}
  }
docs: // WithStrippedPrefix sets the environment variable prefixes to scope to.
  // These prefixes will be removed from the actual config entries.