code: func HasConcurrency(ctx context.Context) bool {
  	iv, ok := ctx.Value(ctxKeyConcurrency).(int)
  	if iv <= 1 {
  		return false
  	}
  	return ok
  }
docs: // HasConcurrency returns true if a value for Concurrency has been set in this context and is bigger than 1
  // since if it is equal to 1, we are not working concurrently.