This is used for communication between FetchOp's when one needs to
provide information to another. It knows how to get the information
required from a FetchData instance. This decouples the receiving
FetchOp from the one providing the data making FetchOp's more reusable.
Note that these must not store any per-fetch instance data. This must go
in the fetchData slot for the FetchOp.
Remember to add to keep
FetchOpDataProxy in sync with this class.
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