[Dev-luatex] numbers formatting

[Taco Hoekwater]

Paweł Jackowski wrote:
> Folks,
> 
> last changes to number formatting in luatex makes things somewhat 
> confusing. Please consider the following.

Hans asked for more precision in tostring() for small numbers, and
this was the result. Please try the latest trunk, which uses a somewhat
different approach ands seems to be more reliable.

Best wishes,
Taco