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What? It's a one-line, clearly understood bugfix. (The extra goto wasn't there in 10.8.x and that hasn't caused any problems) Rebuild the library, spend a few days regression testing at least software update so you can re-push another update, and ship it at the same time as the ios and appletv fixes!

You don't spend a week holding the fix hostage so you can fine tune a new os release with "improvements to autofill forms" in safari while script kiddies are running wild with mitmproxy.

Also I would think that a full ios+appletv OS release is much more complicated than an OSX release due to the way the mobile OSes are packaged (probably 10+ unique/model restore images plus delta downloads)