pub fn prepare_commit(
current: &CheckpointV2,
snapshot: CheckpointV2,
claim_token: &str,
expected_revision: u64,
) -> CheckpointResult<Option<CheckpointV2>>pub fn prepare_commit(
current: &CheckpointV2,
snapshot: CheckpointV2,
claim_token: &str,
expected_revision: u64,
) -> CheckpointResult<Option<CheckpointV2>>