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Comment on Universally Unique Lexicographically Sortable Identifier

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Uses Crockford's base32 for better efficiency and readability (5 bits per character)

From what I can tell, this is the alphabet:

  0123456789ABCDEFGHJKMNPQRSTVWXYZ
Is there any reason why Crockford's alphabet hasn't been rolled into an RFC that supersedes RFC 4648 if it's more efficient and readable?

RFC 4648 specifies [0-9a-v] (base32hex) and [a-z2-7] (base32).

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