Option for constructing a CancellationScope
If false, prevent outer cancellation from propagating to inner scopes, Activities, timers, and Triggers, defaults to true. (Scope still propagates CancelledFailure thrown from within).
CancellationScope | typeof
An optional CancellationScope (useful for running background tasks).
NO_PARENT symbol is reserved for the root scope.
Time in milliseconds before the scope cancellation is automatically requested