method Deno.AtomicOperation.prototype.sum AtomicOperation.prototype.sum(key: KvKey,n: bigint,): this Shortcut for creating a `sum` mutation. This method wraps `n` in a [`Deno.KvU64`](../././~/Deno.KvU64), so the value of `n` must be in the range `[0, 2^64-1]`. Parameters key: KvKey n: bigint Return Type this