> 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 ..) ..)