- The assertion attempts to prove spec_u64_to_le_bytes(x1).len() == 8 for an arbitrary u64 x1 derived from (s.len() as usize) as u64. - At this point, we have linked p1 to x1.ghost_serialize() and ...

- The assertion checks that the LE serialization of a u64 has fixed length 8: spec_u64_to_le_bytes(x1).len() == 8. - Current state: x1 and x2 are u64 values derived from lengths; we already ...