docs: def v1_tag_associations(tags, tag):
      '''Retrieve associations for a given tag.
  
      The associations returned have the exact same structure as defined
      in the ``v1_tag_associate`` route with one addition: a ``tag``
      field contains the full tag name for the association.
      '''
      tag = tag.decode('utf-8').strip()
      return {'associations': tags.assocs_by_tag(tag)}