[plt-scheme] Interaction of shared and first, second, etc. (bug?)

I was under the impression that first was a synonym for car, second  
for cadr, etc. But apparently,, this isn't so with shared variables

 > (shared ((a (cons 1 a))) (car a))
1
 > (shared ((a (cons 1 a))) (cadr a))
1
 > (shared ((a (cons 1 a))) (first a))
. . first: expected argument of type <non-empty list>; given #0=(1 .  
#0#)
 >




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