fix: remove simp attribute from getLastD-related lemmas #75
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Lemmas that turn getLast and its variants into getLastD are unworkable in the context of mathlib, where there are a lot of lemmas about the former but none about the latter (since it had no Lean 3 equivalent).
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Lemmas that turn getLast and its variants into getLastD are unworkable in the context of mathlib,
where there are a lot of lemmas about the former
but none about the latter (since it had no Lean 3 equivalent).