Is this an instance of the maxim that one has to be twice as smart to debug code as to write it?

Are you aware of any APL programs written using Literate Programming?

Apparently there was at least one attempt:

Lee J. Dickey. Literate programming in APL and APLWEB. APL Quote Quad, 23(4):11–??, June 1, 1993. CODEN APLQD9. ISSN 0163-6006.

Perhaps that additional layer of documentation would help? (APL is a language I've always been fascinated by, but never had occasion to more than superficially examine)