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NaN-tagging (JSC 64 bit)In 64 Virtual machine and javascript engine

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NaN-tagging (JSC 64 bit)In 64 bit system, we can only use 48 bits, that means it will have 16 bits are 0 * The top 16-bits denote the type of the encoded JSValue: * * Pointer { 0000:PPPP:PPPP:PPPP * / 0001:****:****:**** * Double { ... * FFFE:****:****:**** * Integer { FFFF:0000:IIII:IIII

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