Ruby on Rails

Hello everyone.

I am having the encoding issue on a simple file upload action:
Encoding::UndefinedConversionError in MainController#upload
"\xC4" from ASCII-8BIT to UTF-8

The action looks like this:
def upload
@uploaded_io = params[:upload]
File.open(Rails.root.join('public', 'images',
@uploaded_io.original_filename), 'w') do |file|
file.write(@uploaded_io.read)
end
end

I changed File.open to 'wb' (binary) and it woked fine. I also tried
switching the ruby version to 1.8.7 while leaving the File.open method
as 'w' (write) which also worked as expected, without any errors.
Should I use 'wb' everytime I want to use files from the filesystem,
or is it the ruby-1.9.2-p0 that comes with RVM cases the issue?

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