Hi!

Some comments:

- The reference implementation allows escape sequences in lower- or
uppercase, but it's not
   specified whether uppercase escape sequences are case-insensitive.
- What's the point of ~_ ?

and:

- Why not go the full way and use Dirk Lutzebaecks full CL format
   (as can be found in SLIB)? It's way more powerful and just as portable.

cheers,
felix