In the standard library, we should use explicit universe variables for universe polymorphic definitions. Users that want to declare universe polymorphic definitions but do not want to provide universe level parameters should use Type _ or Type*
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76 B
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λ (A : Type u_1) (x y : A) (H₁ : x = y) (H₂ : y = x), eq.rec H₁ H₂
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