fn merge_for_write(
existing: &[u8],
rec: &NamedAgentRecord,
session: SessionWrite,
) -> Result<Option<Vec<u8>>, RegistryError>fn merge_for_write(
existing: &[u8],
rec: &NamedAgentRecord,
session: SessionWrite,
) -> Result<Option<Vec<u8>>, RegistryError>