[NTG-context] \unit parser ignoring case, in some cases.

[Gavin]

> On Mar 13, 2023, at 3:44 PM, Hans Hagen via ntg-context <ntg-context at ntg.nl> wrote:
> 
> On 3/9/2023 2:04 PM, Gavin via ntg-context wrote:
>> \startformula
>>   \unit{3 meter} \qquad
>>   \unit{6 Meter} \qquad
>>   \unit{3 mEtEr} \qquad
>> \stopformula
>> Units with lowercase prefixes (c, k, n).
>> \startformula
>>   \unit{3cm} \qquad
>>   \unit{6kg} \qquad
>>   \unit{3ns} \qquad
>> \stopformula
>> Units with capital letters, called with names (coulomb, kelvin, newton).
>> \startformula
>>   \unit{3 coulomb} \qquad
>>   \unit{6 kelvin} \qquad
>>   \unit{3 newton} \qquad
>> \stopformula
> 
> you can look at phys-dim and see plenty of short and long keys and making all case insensitive is asking for troubles

Indeed, I would like to make NONE of them case insensitive. But currently, when I register an upper case key (C=coulomb) it messes up the lower case prefix (“cm" gets typeset as C•m). I was expecting the parser to distinguish between the “C” and “c”, but it doesn’t. Is that intended?

Gavin