How to use the @orbit/data.equalRecordIdentitySets function in @orbit/data

Object.keys(replacement.relationships).forEach(field => {
          let data = deepGet(replacement, ['relationships', field, 'data']);
          if (data !== undefined) {
            let currentData = deepGet(current, [
              'relationships',
              field,
              'data'
            ]);
            let relationshipChanged;

            if (Array.isArray(data)) {
              if (currentData) {
                relationshipChanged = !equalRecordIdentitySets(
                  currentData,
                  data
                );
              } else {
                relationshipChanged = true;
                currentData = [];
              }
            } else {
              if (currentData) {
                relationshipChanged = !equalRecordIdentities(currentData, data);
              } else {
                relationshipChanged = true;
                currentData = null;
              }
            }

Object.keys(replacement.relationships).forEach(field => {
          let data = deepGet(replacement, ['relationships', field, 'data']);
          if (data !== undefined) {
            let currentData = deepGet(current, [
              'relationships',
              field,
              'data'
            ]);
            let relationshipChanged;

            if (Array.isArray(data)) {
              if (currentData) {
                relationshipChanged = !equalRecordIdentitySets(
                  currentData,
                  data
                );
              } else {
                relationshipChanged = true;
                currentData = [];
              }
            } else {
              if (currentData) {
                relationshipChanged = !equalRecordIdentities(currentData, data);
              } else {
                relationshipChanged = true;
                currentData = null;
              }
            }

replaceRelatedRecords(
    cache: SyncRecordAccessor,
    op: ReplaceRelatedRecordsOperation
  ): RecordOperation | undefined {
    const { record, relationship, relatedRecords } = op;
    const currentRelatedRecords = cache.getRelatedRecordsSync(
      record,
      relationship
    );

    if (
      currentRelatedRecords === undefined ||
      !equalRecordIdentitySets(currentRelatedRecords, relatedRecords)
    ) {
      return {
        op: 'replaceRelatedRecords',
        record,
        relationship,
        relatedRecords: currentRelatedRecords || []
      };
    }
    return;
  },

async replaceRelatedRecords(
    cache: AsyncRecordAccessor,
    op: ReplaceRelatedRecordsOperation
  ): Promise {
    const { record, relationship, relatedRecords } = op;
    const currentRelatedRecords = await cache.getRelatedRecordsAsync(
      record,
      relationship
    );

    if (
      currentRelatedRecords === undefined ||
      !equalRecordIdentitySets(currentRelatedRecords, relatedRecords)
    ) {
      return {
        op: 'replaceRelatedRecords',
        record,
        relationship,
        relatedRecords: currentRelatedRecords || []
      };
    }
    return;
  },