In your previous mail you wrote:

   We could implement Steve's proposal if we invented unique space of
   identifiers that covers all scopes. And I admit it would be useful if
   we can specify the outgoing interface by the sin6_scope_id field
   without any other APIs (such as socket options), but it would be too
   complecated for application programmers, especially on properly using
   different type of sin6_scope_id values (i.e. sometimes use it as an
   interface identifier, and sometimes use it as a zone identifier of a
   larger scope).
   
=> do you believe we should use conditional? In fact the sin6_scope_id
space is not yet specified then in theory it is not too late.

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