[luatex] How to get a \mid binary relation that grows in LuaTeX

[Hans Hagen]

On 11/16/2017 9:25 AM, Ulrike Fischer wrote:
> Am Wed, 15 Nov 2017 22:13:25 +0100 schrieb Hans Hagen:
> 
>> the next version will use the normal class numbers
> 
> Can one query the number by name? So that
> \Umiddle class \directlua{whatever(rel)}  gives now 5 and in the
> next version 3?
these numbers are documented part of traditional tex, so we use that 
'rel' number now (the internal ones are just that: internal)

Hans


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