[luatex] Getting a glue node subtype on lua side

[Taco Hoekwater]

On 05/23/2011 11:43 AM, Paul Isambert wrote:
>
> Of course you have to check development regularly to make sure glue
> subtypes don't change (for instance, I think there might be a
> glue-from-space-character subtype someday).

Next time anything changes to those numbers, I will also write a
function to avoid further confusion.

Best wishes,
Taco