What exactly do you mean by "defining the physical representation of the data"? Like, "here is a type called uint32, it is a 32 bit little endian unsigned numbe

What exactly do you mean by "defining the physical representation of the data"? Like, "here is a type called uint32, it is a 32 bit little endian unsigned number. Here is struct Foo, it has two uint32 fields". Like, that level of granularity? Basically Katai struct but can also be used to serialize, not just deserialize?