pseudo-header for checksum?

Roy Smith <[email protected]>
Newsgroups gmane.network.ipv6.general
Message-ID <[email protected]>
Why does RFC  2460 defines a "pseudo-header" for checksum calculations? 
  Why could a normal IPv6 IP header structure not been used, setting the 
version, class, and label to zero?  What's the operational advantage to 
defining a different layout?

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