Sites behind hard bot challenges often leave their feeds open. distill()
now detects feed XML, converts entries (title, byline, link, escaped HTML
body) into a plain HTML document, and everything downstream is unchanged.
fetch accepts xml content types. Ships a stackoverflow.com spec mapping
question/tag/user onto the feed URLs.
Live: oc open on a Stack Overflow question feed renders ~493 tokens vs
~29k for the page HTML, HTTP 200 where the HTML page is challenged.
