Need reference to good ABNF for \uXXXX syntax

[Markus Scherer]

On Wed, Apr 14, 2021 at 3:55 PM Doug Ewell via Unicode <unicode at unicode.org>
wrote:

> (My contribution was to define non-surrogate, high-surrogate, and
> low-surrogate separately instead of making this one behemoth rule.)
>

lgtm

I personally like to use "lead surrogate" and "trail surrogate" because I
find "high" vs. "low" confusing.

markus
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