package tezos-requester

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When a requested value is received, it goes to a validation phase.

At fetching time, the client gives a param. At notification time, the client provides a notified_value. probe tries to construct a value from param and notified_value.

If no validation is needed. probe is defined as

let probe k () v -> Some v

type key
type param
type notified_value
type value
val probe : key -> param -> notified_value -> value option