Isn't the string comparison claim also wrong? Although plenty of UUIDs are passed as strings in eg JSON, I was under the impression that where performance real

Isn't the string comparison claim also wrong? Although plenty of UUIDs are passed as strings in eg JSON, I was under the impression that where performance really matters (like db indexes) they were stored and compared as 128 bit fields. To be fair, the points about word sizes and ordering make sense.