On Mon, 28 Jun 2010, Wolfgang Schuster wrote:

> Am 28.06.10 23:03, schrieb Tom:
>> Making the following changes resulted in ! Missing Number, treated as zero.
>> 
>
> I’m lazy:
>
> \defineconversion[numstring][One,Two,Three,Four,Five,Six,Seven,Eight,Nine,Ten,...]

or even

\defineconversion[numstring][\numstr]

and then everything works (except capitalization, that is)

> \setuphead[chapter][conversion=numstring]
> \starttext
> \dorecurse{11}{\chapter{Chapter #1}}
> \stoptext

Aditya