I just found that \choose has been replaced with \binom (binomial coefficient):
\starttext
\meaning\choose
\meaning\binom
$\binom{n}{k}$
\stoptext
Sorry for complaining… :-)
> On 9 Jul 2022, at 00:34, Otared Kavian <ota...@gmail.com> wrote:
>
>
>
>> On 6 Jul 2022, at 22:10, Hans Hagen via ntg-context <ntg-context@ntg.nl>
>> wrote:
>>
>> Hi,
>>
>> We're pleased to announce the first official release of the new math code.
>> We're talking of:
>>
>> […]
>
> Dear Hans and Mikael،
>
> Thank you very much for the new upload and the new stuff for tyepsetting
> maths. I have been playing around with the features presented in the example
> file sent by Mikael, and I must say, among other things you have implemented,
> the constructs \bearkhere and \skiphere, and friends, are absolutely great,
> brilliant and so simple! I wonder why such a simple and elegant solution was
> not around before…
>
> As a plain TeX traditionalist I am a little bit sad to let the \over
> construct be ditched, but my sadness did not last too long.
>
> It seems that the \choose construct has been ditched but I did not guess what
> has replaced it (I guess the reason is the same for ditching \over, since the
> construct used to be ${n \choose k}$ and this is not what one wants to have
> in a macro).
>
> Best regards: Otared
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