On Wed, May 27, 2020 at 11:28 PM Pablo Rodriguez <oinos@gmx.es> wrote:

>
> Without commas, lists are harder both to read and to write (at least, to
> me).
>
>

what about

\starttext
\startTEXpage[offset=1em]
\doifinsetelse{i7}{%
i4,%
i5,%
i7,%
}
        {yes}{no}
\stopTEXpage
\stoptext

here seems to work.
-- 
luigi