From: matz@... (Yukihiro Matsumoto)
Date: 2003-08-03T16:41:41+09:00
Subject: [ruby-dev:21094] Re: (ary - ary) preserves duplicated values

まつもと ゆきひろです

In message "[ruby-dev:21093] (ary - ary) preserves duplicated values"
    on 03/08/03, Koji Arai <JCA02266@nifty.ne.jp> writes:

|rubicon やってて気が付いたのですが、念のため確認ですが、以下
|は仕様変更ですね？

はい。

|p([1, 2, 1, 3, 1, 4, 1, 5] - [2, 3, 4, 5])
|=> ruby 1.6.8 (2002-12-24) [i586-linux]
|   [1]
|=> ruby 1.8.0 (2003-02-16) [i586-linux]
|   [1, 1, 1, 1]
|=> ruby 1.8.0 (2003-08-01) [i586-linux]
|   [1, 1, 1, 1]