JSC, Chakra, and Spidermonkey use NaN-tagging for values; 32 bit integers, 52-bit pointers, and 64-bit doubles are all encoded into one word, with the former tw

JSC, Chakra, and Spidermonkey use NaN-tagging for values; 32 bit integers, 52-bit pointers, and 64-bit doubles are all encoded into one word, with the former two using encodings that fall into the NaN space.