export interface Sequential {
   readonly _tag: "Sequential";
}

export interface Parallel {
   readonly _tag: "Parallel";
}

export interface ParallelN {
   readonly _tag: "ParallelN";
   readonly n: number;
}

export const sequential = (): Sequential => ({
   _tag: "Sequential"
});

export const parallel = (): Parallel => ({
   _tag: "Parallel"
});

export const parallelN = (n: number): ParallelN => ({
   _tag: "ParallelN",
   n
});

export type ExecutionStrategy = Sequential | Parallel | ParallelN;