> Some coders use the convention that showing the nil initial
> value explicitly indicates that this is the initialization,
> whereas `(foo)' indicates that the `let' body will perform
> the (real, significant) initialization.

The suggestion was to consider the below form as invalid.

(letrec ((SOMEVAR1)
         (SOMEVAR2) ..) ..)

Not the below:

(letrec (SOMEVAR1
         SOMEVAR2 ..) ..)