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expansion of LETREC

I favor position number 1.  The reason: it is a relatively simple
solution to what seems a relatively unimportant issue.

I think that implementors are free to use a procedure like
UNINITIALIZED internally, thus preserving LAMBDA as the sole binding
operator.  MIT Scheme does just this.  The syntax for LETREC (and
optionally, LET) provides the user with a means of creating
uninitialized variables.