package async_extra

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package async_extra
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Implements a value that is either in a file, or in memory, but not both. Is used by live and the friend to store sequence numbers and counters. If the value is moved to memory, changed, and then the process crashes, the file will correctly reflect that the value has been lost.

module type Arg = Core.Sexpable
module type S = sig ... end
module Make (Z : Arg) : S with type persistent_singleton = Z.t