[chuck-users] is 'string' a primitive type?

Hi When I click 'add shred' with the following code: public class A { static string a; } it throws following message: [*unnamed1]:line(3): cannot declare static non-primitive objects (yet)... [*unnamed1]:line(3): ...(hint: declare as ref (@) & initialize outside for now) as if string is non-primitive. And when I follow the suggestion and use a ref public class A { static string @ a; } it throws the following message: [*unnamed1]:line(3): cannot declare references (@) of primitive type 'string'... [*unnamed1]:line(3): ...(primitive types: 'int', 'float', 'time', 'dur') as if string is a primitive type. Is it a code limitation or am I doing something wrong? Thanks in advance! Kiran