value not printed for string variables

[nrueh]

This program has the following output

a("a").
&in{1..2} =: X :- a(X).

b :- &sum{"a"} = 1.

fclingo test.lp 0
fclingo version 0.1
Reading from test.lp
Solving...
Answer: 1
a("a")
Answer: 2
a("a") b
SATISFIABLE

Changing "a" to a gives the expected output

fclingo test.lp 0
fclingo version 0.1
Reading from test.lp
Solving...
Answer: 1
a(a) val(a,2)
Answer: 2
a(a) b val(a,1)
SATISFIABLE

[nrueh]

This seems to affect printing only, inside my application class I have access to all the values through the __csp predicates.