From: Lui Kore <usurffx@...>
Date: 2010-01-17T12:55:53+09:00
Subject: Strange Encoding Behavior

The encoding of __FILE__ is always the same as Encoding.default_external
even if there is a magic column. Sometimes it is necessary to convert
the string into another encoding. Here is some code to demonstrate the
issue:

#coding: utf-8
    # put the script in a not-pure-ascii path to see the difference
    path = File.expand_path File.dirname __FILE__

    puts RUBY_VERSION + ' ' + RUBY_PLATFORM
      #=> "1.9.1 i386-mingw32" is my ruby version
    puts path.encoding
      #=> "GB2312" on my OS

    # usually this "string.encode to, from" works,
    # but HERE the new string's content bytes seems unchanged
    puts \
      path.encode 'utf-8', Encoding.default_external

    path.force_encoding Encoding.default_external
    puts path.encode 'utf-8'
      # changed at last
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