[plt-scheme] Describe Function

> What other first-class data object would be useful to include 
> (parameters, which get described as procedures now, modules, units, 
> signatures, processes, ...)?

FWIW, I once tried to come up with a list of built-in PLT datatypes, 
which you can find here:

     http://bit.ly/2MSZtM

(It's about 7 or 8 months old and there are probably plenty of omissions.)

Dave