Sending (seq 1 2 3) to jetta server results in error

[Necr0x0Der]

While using (seq 1 2 3) in function definitions works fine, sending directly (seq 1 2 3) to jetta server results in compilation error.

[Necr0x0Der]

Moreover, the code doesn't compile

(@ goo multivalued)
(: goo (-> Int))
(= (goo) (+ 1 (seq 1 2 3)))

while the code compiles

(@ goo multivalued)
(: goo (-> Int))
(= (goo) (seq 1 2 3))
(@ doo multivalued)
(: doo (-> Int Int))
(= (doo $x) (+ $x (goo)))

meaning that calls to seq cannot be used in other expressions.