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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: What is the history behind Natural'First = 0 ?
Date: Mon, 04 May 2020 01:50:19 -0700
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
> The 1980 edition had the same thing.  I know there was another
> preliminary version in 1982 (before the first official standard in
> 1983), but I don't know what it said.

In math nowadays, "natural numbers" and ordinals are generally
considered to begin with 0 rather than 1.  I think that reflects a
cultural change that might have been taking place around the 1980s.
There is some discussion here:

https://en.wikipedia.org/wiki/Natural_number#Modern_definitions