`epithet-rename-buffer` causes `eww` to create multiple buffers of the same site

[duckwork]

The problem:

If I open the same link with eww twice, it opens two buffers to the same
site. I.e., *eww*<https://example.com>, *eww*<https://example.com><2>, and
so on.

Thoughts:

I'm not totally sure how to fix this; the eww function itself is what causes
this problem:

(pop-to-buffer-same-window
   (cond
    ((eq arg 4)
     (generate-new-buffer "*eww*"))
    ((eq major-mode 'eww-mode)
     (current-buffer))
    (t
     (get-buffer-create "*eww*"))))

I'm creating this issue to bring it to your attention, I guess? As far as I
can think, the way to fix it would be to redefine eww to look for other
buffers with the same URL, or delete duplicates after they're made and switch
to the “real” buffer. Of course, neither of those are … great ideas. I'm open
to others!