SparkID: Fast, sortable, compact unique IDs

A bit confused:

> SparkID generates 21-character IDs using the Base58 alphabet, which specifically excludes 0, O, I, and l. No visual ambiguity, no hyphens, no underscores. Just clean, alphanumeric strings.

But the example ID has both the "1" digit and the letter "o":

> "1ocmpHE1bFnygEBAPTzMK"

Am I missing something?