Function deserialize 

pub fn deserialize<T: DeserializeOwned>(
    bytes: &[u8],
) -> Result<T, CachekitError>

Deserialize an interop-mode MessagePack document, consuming exactly one document and rejecting trailing bytes (spec MUST).

rmp_serde::from_slice silently ignores trailing bytes. That leniency is dangerous here: a Python-SDK-internal CK frame begins 0x43 ('C'), which is a complete one-byte MessagePack document (positive fixint 67) — a lenient reader would silently decode an entire CK frame as the integer 67.

A payload with the 0x43 0x4B ("CK") prefix gets a specific diagnostic naming the Python auto-mode frame instead of a generic trailing-bytes error.

Errors

CachekitError::Serialization if the payload is a CK frame, is not valid MessagePack, or has trailing bytes after the first document.