export function removeWorsePrepubField500s(record) {
  // Remove lower-level entries:
  const fields = getRelevant5XXFields(record, true, false); // 500=false, 594=true
  nvdebugFieldArray(fields, '  Candidates for non-best 500 b4 filtering: ', debugDev);
  const nonBest = fields.filter(field => fields.some(field2 => firstFieldHasBetterPrepubEncodingLevel(field2, field)));