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We're reasonably certain our downcasts are correct, so we can reduce our code size and improve speed slightly by disabling downcasts. We also hardly use the class names, so we can drop the class metadata objects from the build. This saves a lot of string data from appearing in the string pool. Together these optimizations reduce our initial download *.cache.html files by about 30K. Change-Id: I5dc633d5bafc1eddf8ac491ae6fe1e643222ffa1 Signed-off-by: Shawn O. Pearce <sop@google.com>