Squid3 ranges

I've come across a request/response like this:

GET http://some-host/some-path HTTP/1.0
Accept: */*
User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Windows 98)
Host: 212.68.148.119
Range: bytes=3927657-4893707
Cache-Control: max-age=259200

HTTP/1.1 206 Partial Content
Server: Microsoft-IIS/5.0
Connection: keep-alive
Date: Wed, 04 Jan 2006 03:21:00 GMT
Content-Type: video/x-msvideo
Last-Modified: Fri, 30 Dec 2005 19:18:04 GMT
ETag: "101c26c275dc61:93f"
Content-Length: 894247
Content-Range: bytes 6818521-7712767/7712768

Which triggered the assertion failure detailed in bug# 624.

Any hints on how squid should handle this bizarre response?
Just forward the reply "as is", return a 409 response, or something else?

Regards,

--
Gonzalo A. Arana