code: def to_int_list(values):
      
      results = []
      for v in values:
          try:
              results.append(int(v))
          except (TypeError, ValueError):
              results.append(0)
      return results
docs: Converts the given list of vlues into a list of integers. If the
      integer conversion fails (e.g. non-numeric strings or None-values), this
      filter will include a 0 instead.