cache object stub

[Vladimir Stavrinov]

Hi All.

While testing varnish 3.0.3 with full stream support, I've faced this
problem. When storage space exhausted the new file fetched from backend
partially overrides some of the existing cache object. But this
truncated object still can be delivered to client, that is wrong,
because actually it is broken file. It looks like bug, because I don't
see any case where this "feature" may be useful.


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###  Vladimir Stavrinov
###  vstavrinov at gmail.com
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