[codex] DecidableEq と BEq の違いを説明#2347
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Summary
Fixes #2005.
LeanByExample/TypeClass/Decidable.leanにDecidableEqとBEqの違いを説明する節を追加しました。BEqが命題としての等号と一致しない例として、Accountのidだけを見る比較を追加LawfulBEqが必要になる場面を#synthの失敗例で確認FloatではBEqはあるがDecidableEqは合成できず、NaN == NaNが false になることを#guardで確認Validation
lake env lean LeanByExample\TypeClass\Decidable.leanlake build LeanByExample.TypeClass.DecidableNote: local
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