∀ {α : Type u} {β : Type v} [inst : BEq α] [EquivBEq α] {l₁ l₂ : List ((_ : α) × β)} {k : α} {fallback : β},
  Std.Internal.List.DistinctKeys l₁ →
    Std.Internal.List.containsKey k l₂ = true →
      Std.Internal.List.getValueD k (List.filter (fun p => Std.Internal.List.containsKey p.fst l₂) l₁) fallback =
        Std.Internal.List.getValueD k l₁ fallback