method Deno.AtomicOperation.prototype.mutate
AtomicOperation.prototype.mutate(...mutations: KvMutation[]): this
Add to the operation a mutation that performs the specified mutation on
the specified key if all checks pass during the commit. The types and
semantics of all available mutations are described in the documentation
for [`Deno.KvMutation`](../././~/Deno.KvMutation).
...mutations: KvMutation[]
this