retry

type Call[T any] func(ctx context.Context, isRetry bool) (T, error)

type Hedged[T any] struct {
	// The function must be thread-safe because multiple instances may be running
	// concurrently. The function must return as soon as possible after context
	// cancellation, otherwise the speculation makes no sense.
	//
	// The function argument indicates whether this is a speculative retry attempt.
	Call    Call[T]
	Trigger <-chan time.Time

	// FailFast specifies how a failure is handled. If it is set to true:
	//  - the result received first is returned, regardless of anything.
	//  - if Call fails before the trigger fires, it won't be retried.
	FailFast bool
}