[no subject]

> So divide the functions into functions that 
> care, and functions that don't. 

Many functions requireless dimensionless numbers, 
e.g. FACTORIAL.

> My guess is that financial 
> functions just won't accept any units (for the initial step), 
> and so might a lot of other functions. My guess is that if 
> you limit units to functions who can actually care about 
> them, there will be far less than 500.

It's possible to use a "not-implemented" transformer that 
will accept any units and not report an error.  That could 
be used to build the full suite of transformers incrementally.

-- Paul