(Technical Change) RSS feeds now served with XML MIME type

For a long time, we’ve served our RSS feeds with a mix of text/xml and application/rss+xml MIME types. The latter is the “correct” MIME type for RSS feeds, but the former is also acceptable. We’re standardizing on the former, despite being less correct in a pedantic sense, because it is recognized by browsers as XML, allowing for XSL stylesheets to be used universally. This will help misdirected listeners to find a way to listen to a podcast without being presented with a wall of machine-readable XML.