Question about contacts dedupe

[5AMsan]

In https://github.com/HubSpot/sample-workflow-custom-code/blob/main/samples/dedupe_contact.js, seaching with filter

[{
  propertyName: DEDUPE_PROPERTY,
  operator: 'EQ',
  value: dedupePropValue
}]

should return 2 contacts if we have dups, but a test says

if (idsToMerge.length > 1) {
  console.log(`Found multiple potential contact IDs ${idsToMerge.join(', ')} to merge`);
  throw new Error("Ambiguous merge; more than one matching contact");
}

so there can't be a deduplication, right ?

[5AMsan]

My bad, must learn to read.