[ih] Why is TUBA assigned IP version 9

[Vint Cerf]

We assigned numbers temporarily but v6 was the next in "line" after v5 was
abandoned. V

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Subject: [ih] Why is TUBA assigned IP version 9

Anyone know why TUBA was assigned IP version 9?

  <http://www.iana.org/assignments/version-numbers/version-numbers.xhtml>

Wouldn't the mere use of TUBA obviate the need for an IP version number
assignment?

John