Questions about --pin-externals option

A couple questions regarding "svn copy --pin-externals":

1) I thought I saw that when the --pin-externals option was being
   developed it handled things differently when the destination was a
   tag verses a branch.

   IIRC, copy --pin-externals to a "tag" destination just pinned the
   revision to the current one (leaving the path the same), but if the
   destination was a "branch" and the source was relative, it would
   leave the version floating and change the path so it too pointed to
   a branch (or something like that).

   Did the branch handling stuff get dropped?

2) Are there server-side version dependancies for use of the
   --pin-externals option? Or will it work with any server version?

Where does one find documentation for 1.9 versions (the book only
covers versions up to 1.8)?

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