Commit the operation to the KV store. Returns a value indicating whether checks passed and mutations were performed. If the operation failed because of a failed check, the return value will be null. If the operation failed for any other reason (storage error, invalid value, etc.), an exception will be thrown. If the operation succeeded, the return value will be a Deno.KvCommitResult object containing the versionstamp of the value committed to KV.

If the commit returns null, one may create a new atomic operation with updated checks and mutations and attempt to commit it again. See the note on optimistic locking in the documentation for Deno.AtomicOperation.