Until waits until the acceptor accepts the current condition, or the context expires, whichever comes first.

UntilDeadline creates a child context with the given deadline, and then invokes the above Until function.

UntilTimeout creates a child context with the given timeout, and then invokes the above Until function.

by default, backoff by 1.5x.

by default, delay by 100ms.

by default, no more than 5 seconds.

Acceptance is meant to accept a condition.