I have a property in my class like so:

public Line[] lines
{
    owned get
    {
        ...
    }
}

The signature of the generated C code looks like this:

Line** class_name_get_lines (ClassName* self, int* result_length1);

I'd like to be able to set the name of the result_length1 parameter myself. In the CCode attribute, there's a parameter called "array_length_cname" that seems like it would be perfect for this, but the documentation says it only applies to fields, and indeed, when I tried to apply it to the property, nothing happened.