"Total body bytes" not actually bytes delivered?

[Chris Hecker]

Today I had somebody repeatedly requesting a big file, but always 
failing pretty fast, I'm assuming due to my version of varnish not 
supporting the Range: header.   But, what surprised me was how fast the 
Total body bytes was building up.  It was a 14mb file, and it was being 
requested a couple times a second, but bailing at < 200kb, but by the 
end of the day TBB was 300gb.  Is that by design, or should it be the 
number of bytes successfully delivered, which seems more useful?

Lots of these in the logs:
- 13 Debug        c "Write error, len = 61920/14628065, errno = Success"

An example of a varnishstat moment when the file was being requested:
- 166499573986  14617409.58   2954687.12 Total body bytes

Chris