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Summary: @public `-ffast-math` does not have measurable performance benefits. By using `NaN` for *undefined* values again, we can squeeze `YGFloatOptional` into 32 bits. This will also enable us to store `YGValue` (or a variant of it) in 32 bits. Reviewed By: astreet Differential Revision: D13403925 fbshipit-source-id: b13d026bf556f24ab4699e65fb450af13a70961b