wrong charset on a w3 page

Reading the page:

Programmable HTTP Caching and Serving

http://www.w3.org/TR/2010/WD-DataCache-20100114/


There appear some strange character sequences like ✘ and ✔.

Server says that the page is encoded in iso-8859-1; in fact, the page 
contains some UTF-8 characters, namely 2718 HEAVY BALLOT X and 2714 
HEAVY CHECK MARK, which do not appear correctly due to the wrong 
charset. Probably this is some configuration error.


HTTP header:

   HTTP/1.0 200 OK
   Date: Mon, 18 Jan 2010 12:58:44 GMT
   Server: Apache/2
   Last-Modified: Thu, 14 Jan 2010 14:48:23 GMT
   ETag: "3327d-47d20fa8fdbc0"
   Accept-Ranges: bytes
   Content-Length: 209533
   Cache-Control: max-age=31536000
   Expires: Tue, 18 Jan 2011 12:58:44 GMT
   P3P: policyref="http://www.w3.org/2001/05/P3P/p3p.xml"
   Content-Type: text/html; charset=iso-8859-1
   Age: 261