for purely return-type based searches, deprioritize clone-like functions

A clone-like function in a function that takes as an argument the type
that it returns.

However, functions that return a type variable are not counted as
clone-line. Because we're not unifying the whole function at once,
a function like `U -> T` would otherwise be counted as "clone-like"
because the generics will just unify with anything when done seperatly.

Co-authored-by: Michael Howell <michael@notriddle.com>

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