The tags 'bidi' and 'right-to-left' seem to indicate the same thing. Questions about right-to-left typesetting are obviously concerned with the duality of both left-to-right and right-to-left. 'bidi' is a term fewer people will know and understand, being a shorthand.
I intend to retag the 3 questions with 'bidi' as 'right-to-left'. Should I do anything before proceeding? After retagging, does the tag 'die' automagically? What about its tag wiki entry?