Hi devs,

I'm (once again) merging master into my type=kind branch. I see that we now 
have tyVarsOfTypeAcc :: Type -> FV, distinct from tyVarsOfType :: Type -> 
TyVarSet. I trust that this new version is more performant. However, I have a 
question: in the implementation of these functions, the three extra FV 
parameters (fv_cand in_scope acc) are bound and passed each time. 

Why?

I've always understood that eta-reducing in function definitions is better than 
expanding. Or is this just a style choice?

Thanks,
Richard
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