SparseMatrixCSC allocation

I tried this

jl_value_t *empty = jl_eval_string("sparse([0 4325; 23 0; 0 0; 245 2352])");
jl_typeis(empty, jl_get_global(jl_base_module, jl_symbol("SparseMatrixCSC")));
jl_typeis(empty, jl_get_global(jl_base_module, jl_symbol("SparseMatrixCSC{Int64}")));
jl_typeis(empty, jl_get_global(jl_base_module, jl_symbol("SparseMatrixCSC{Int64,Int64}")));

And none of them gave positive. Why is this?

Thank you