Since the change to records a few months ago, I've seen a bug with `url-history-save-history'.  When I try to run it, I see:

Error running timer ‘url-history-save-history’: (wrong-type-argument stringp #s(url "https" nil nil "duckduckgo.com" nil "/html/?q=emacs" nil nil t nil t))

A backtrace puts it at the `string-match' call in `url-history-save-history'.  I think the problem is that url-history is using a url struct instead of a string, which, according to `url-history-update-url', isn't supposed to be happening.

The following patch should fix this: