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This PR changes the closure type used for data exchange from
Fn
toFnMut
, allowing it to own its own mutable state and preventing it from being called concurrently.The motivation is that some more sophisticated exchange functions might take e.g. a
Vec<D>
and pick out a subset of elements, and hash the result. This is easiest when the closure owns its ownVec<D>
that can be populated (or even aVec<&D>
, though lifetimes probably prevent that).