Rails send_data and UTF-8

I often use send_data to output plain text from a Rails action, typically as a simple way to download, say, a CSV format file.

I'll have something like this to output the text to the browser:


      send_data(@output, :type => 'text/plain', :disposition => 'inline')

But if the text is UTF-8 and contains non-ASCII characters then you need to specify the character set. 

Confusingly, to me, you don't do this with a separate argument at the Rails level. Instead you add it as a modifier on the :type argument like this:

      send_data(@output, :type => 'text/plain; charset=utf-8', :disposition => 'inline')