Io.dup doesn't handle pos properly

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Bug #2747: io.dup doesn’t handle pos properly
https://bugs.ruby-lang.org/issues/2747#change-31076

Author: kosaki (Motohiro KOSAKI)
Status: Rejected
Priority: Normal
Assignee:
Category: core
Target version: 2.0.0
ruby -v: ruby 1.9.2dev (2010-02-03) [x86_64-linux]

=begin
記録のために、IRCから転記します。

duptest.rb

f1 = File.new(“foo.txt”)
f2 = f1.dup()
p f1.pos
p f2.gets
p f1.pos
p f2.pos

foo.txt

1
2
3

このようなテストプログラムを実行すると、

0
“1\n”
6
2

となります。dupはf1とf2で同じposが返るべきであるし、6はどこから出てきたのかよく分かりません。
=end

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