From: Apple Product Security
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APPLE-SA-2015-10-21-7 Xcode 7.1

Xcode 7.1 is now available and addresses the following:

Swift
Available for:  OS X Yosemite v10.10.5 or later
Impact:  Swift programs performing certain type conversions may
receive unexpected values
Description:  A type conversion issue existed that could lead to [...]