protocol Pbuiltins {

    // sanity-check that "essential" builtins are being declared

child: async Msg(bool b,
           char c,
           int i,
           long l,

           float f,
           double d,

           int8_t i8t,
           uint8_t u8t,
           int16_t i16t,
           uint16_t u16t,
           int32_t i32t,
           uint32_t u32t,
           int64_t i64t,
           uint64_t u64t);
};