Deterministic Byte Order Guarantees for Racket's serialize/write Across Releases

Deterministic Byte Order Guarantees for Racket's serialize/write Across Releases

The racket/serialize module’s write procedure serializes any Racket value to a byte stream that read can reconstruct exactly for immutable data, while mutable containers are restored as fresh copies.

When planning long‑term backup or archival, a designer may need to know whether the byte stream produced by write is deterministic across different Racket versions, so that a file created with one release can be reliably read by another without re‑serializing.

The documentation leaves open whether the serialization format is stable or version‑dependent, and it is unclear what guarantees exist for byte order, sharing preservation, or handling of mutable values when the reader runs on a different release.

• Does write produce identical byte sequences for the same input value when executed under two different Racket versions?
• If the byte stream differs, what aspects of the format are guaranteed to remain compatible (e.g., ability to read back an equal?‑equivalent value)?
• What version‑specific constraints should be considered when using write/read for backup/restore scenarios that span multiple releases?