Issue #12436 has been reported by Benoit Daloze.

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Bug #12436: newline argument of File.open seems not respected on Windows
https://bugs.ruby-lang.org/issues/12436

* Author: Benoit Daloze
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.4p230 (2015-12-16 revision 53155) [i386-mingw32]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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~~~ruby
File.open("abc", "wt", newline: :lf) { |f|
  f.write "a\n"
  f.puts "b"
}
~~~

will create a file with CRLF newlines, ignoring the newline conversion argument.
It should write only LF instead, like on other platforms when the newline conversion is specified.



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