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Summary: @public After removing `-ffast-math`, `NaN` can again be used to represent `undefined`. That allows us to remove the additional flag from `YGFloatOptional`, and reduce memory usage. Reviewed By: SidharthGuglani Differential Revision: D13209157 fbshipit-source-id: 21b83c837a78f924a4ec23a9236ca2440b3c8606