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This swaps
externforunthunkwhich just removes a layer of thunking,
rather than attempting to fully get from a differential to a primal
It is needed for #61 but is distrinct (that PR currently sits ontop of this one though)
Note that even in double thunking cases:
1+@thunk(@thunk(2))becomes1 + @thunk(2)becomes1+2so addition is still fine.
This also occurs in #54