code: def check_array_collapse(data, field_def)
        result = data
        if !field_def[:min_occurs].nil? &&
            (field_def[:max_occurs] == :unbounded ||
                (!field_def[:max_occurs].nil? && field_def[:max_occurs] > 1)) &&
                    !(field_def[:type] =~ /MapEntry$/)
          result = arrayize(result)
        end
        return result
      end
docs: Checks if the field signature allows an array and forces array structure
   even for a signle item.