Not exactly, since they are using a fiber API instead of one built with raw continuations. In this context, being one-shot means that there is no operation for

Not exactly, since they are using a fiber API instead of one built with raw continuations. In this context, being one-shot means that there is no operation for cloning or "forking" a fiber. Each time you resume the execution of a fiber, it continues to execute until it reaches its next yield point. There is no way to go "back in time" and resume execution from a previous state of the fiber, which is what multishot coroutines or the fork system call would let you do.