tags are expanded before global opts are validated

[djerius]

I (mis?)understood the documentation to indicate that _exporter_validate_opts would be called at the beginning of processing, which would allow setup (in my case, adding extra information to the global options which could be used down stream, in particular by _exporter_expand_tag).

However, _process_optlist (and thus _exporter_expand_tag) is called prior to _exporter_expand_sub.

I can work around this, but it'd be good to know if it's me, the docs, or the code which has the correct view of reality.

Thanks,
Diab