On 7/15/2018 17:39, Fabrice Couvreur wrote:
> \setupbodyfont[pagella,11pt]
>
> \defineframed
>    [ACFRAME]
>    [frame=off,
>     offset=0pt,
>     location=low,
>     width=\struttotal,
>     background=color,
>     backgroundcolor=black,
>     foregroundcolor=white,
>     forgroundstyle=bold]
>
>
> \defineprocessor[ACPROCESSOR][command=\ACFRAME]
> \defineconversionset[ACCONVERSION][][ACPROCESSOR->n]
>
> \defineenumeration
>    [ex]
>    [text=,
>     distance=0.3em,
>     width=fit,
>     numberconversionset=ACCONVERSION,
>     alternative=serried]
>
> \starttext
>
> \dorecurse{5}
>    {\startex
>     \input knuth
>     \stopex}
>
> \stoptext

Looks like a font issue -- it does not happen with LM or ebgaramond.

-- 
Rik