macro NULL 0 end
macro false 0 end
macro true 1 end

macro div divmod drop end
macro mod divmod swap drop end
macro / div end
macro % mod end

macro 2dup over over end
macro 2drop drop drop end

macro sizeof(u64) 8 end
macro sizeof(u32) 4 end
macro sizeof(u16) 2 end
macro sizeof(u8)  1 end