@type t() :: %Flamel.Retryable.Http{
  assigns: map(),
  attempt: integer(),
  base: integer(),
  halt?: boolean(),
  interval: Flamel.Retryable.interval(),
  max_attempts: integer(),
  max_interval: Flamel.Retryable.interval(),
  multiplier: integer(),
  reason: binary() | nil,
  with_jitter?: boolean()
}