What's the function for converting a ulong to a native-endian
byte array?
For example,
auto bytes = 0x1234567890123456u64.to_ne_bytes();
// should yield
// [0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56] in big-endian
and
// [0x56, 0x34, 0x12, 0x90, 0x78, 0x56, 0x34, 0x12] in
little-endian systems
Also, what's the function for constructing a ulong from a
native-endian byte array?
For example,
auto value = from_be_bytes!ulong([0x12, 0x34, 0x56, 0x78, 0x90,
0x12, 0x34, 0x56]);
// value is 0x1234567890123456
Rust equivalent:
https://doc.rust-lang.org/std/primitive.u64.html#method.to_ne_bytes
