On 8/8/2025 9:21 PM, user691586 via ntg-context wrote:
I meant of course "natively active in Plain TeX". I was referring to the
format, and applies to the pdftex, xetex, luatex engines too.
it is unrelated to engines: any can define any character active
what luametatex adds is more features and control, when configured to
kick in which is what we do
(just like ^^ and __ in math have meaning but only when enabled)
Hans
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