code: function _possibilites(str) {
      const parts = str.split(',');
  
      return Utils.chain(parts)
        .map(p => Utils.trim(p))
        .compact()
        .value();
    }
docs: @private
  
  Turns a comma-separated list of choices into an array
  
  @param {string} str
  @return {array}
  
  @todo Needs a better parser that takes into account quotes, escaped chars etc