~= cf :integer format { 
    ~base { ~digit #1; ~digit #0; }; 
    ~order #big-endian;
    ~padding { ~digit #1; };
    ~group { 
        ~separator #chars."."; 
        ~count { ~digit #3; }; 
        ~backward; 
    };
    ~chars {
        ~negative #chars."-";
        ~digits "0123456789";
    };
};