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Update NSScanner to use BinaryFloatingPoint #631
Migrate from internal
Incidentally fix a subtle bug and align to Darwin Foundation:
I've adjusted the behavior accordingly and written a test.
Annoyingly, one test is currently failing on my machine, but it fails both with and without this patch and must be unrelated (i.e., it is failing with a freshly checked-out copy of swift-corelibs-foundation on XCode 8 GM):