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HTTPS or Subversion.
Shiira 2.2 (a Japanese WebKit based browser) is misdetected as Safari 1.2 (which is actually the webkit version used by Safari 3.2.3)
During my testing, I found Safari would sometimes (spurious, as I have difficulty reproducing) send a truncated User Agent, e.g.,
(In ) fixes #2099 - treat Shiira as Safari since Shiira uses the installed version of Safari's webkit; for truncated UA, use the AppleWebKit version for detection