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No need to split it out when there's only a single
class using it.
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Rack::Utils::HeaderHash is still very expensive in Rack 1.2,
especially for simple things that we want to run as fast as
possible with minimal interference. HeaderHash is unnecessary
for most requests that do not send Content-Range in responses.
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Errno::EAGAIN is still a problem under Ruby 1.9.2, so try harder
to avoid it and use kgio methods. Even when 1.9.3 is available,
kgio will still be faster as exceptions are slower than normal
return values.
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Despite the large number of changes, most of it is code
movement here.
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