chnage(ev) always called with ev.data[0] === "initSelection()"

gistfile1.txt

  $('.tags.select2').each ->
    vocab = $(this).closest('.vocab').data('vocab')
    opts = {
      initSelection: (element, callback) ->
        callback(env.tags[vocab])

      multiple: true
      #allowClear: true
      placeholder: 'Select one or more'

      # Load all the terms for this vocab.
      ajax: {
        url: env.terms_path
        dataType: 'json'
        data: ->
          { vocab: vocab }

        results: (data, pagenum) ->
          #console.log(data);
          { results: data }
        }

      tokenSeparators: [',', ';', ' ']
      }

    if $(this).hasClass('user-defined')
      opts.createSearchChoice = (term) ->
        console.log("createSearchChoice(#{term})")
        { id: term, text: term }

    $(this).select2 opts

    .change (ev) ->
      # console.log(ev.val);
      # There is a bug: ev.val[0] === "initSelection()"
      if ev.val[0] == "initSelection()"
        ev.val = ev.val.slice(1)  # lopp it off

      $.ajax env.content_update_tags_path, {
        method: 'put',
        data: {
          tags: {
            vocab: vocab,
            terms: ev.val
          }
        }
      }