A tiny library to declaratively define endianness in a portable way, for IO.
Allows an easy .native()
method to convert to native endianness.
```rust
struct SomeStruct {
first: Big
let foo = SomeStruct { first: Big([2, 1]), second: Big([2, 1, 1, 1]), };
asserteq!(foo.first.native() + foo.second.native(), 513 + 33620_225) ```