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Object#===
の記述を修正しました。Object#===
は内部でObject#==
を呼んでいますが別名ではないため、より適切な形に修正しました。Object#===
がどのようなメソッドなのかというのを第1文目で示すようにしました。===
の呼び出され方について、例に解説を加えました。https://github.com/ruby/ruby/blob/3f5ec5c8661748afb9cc3cbf1aff113d602e1fad/object.c#L4338