• The JavaScript specification (ECMA 262) says that all numbers should behave like 64 bit doubles
• JavaScript does not allow for direct memory access / weird type casting though...
• FP operations are often slower than integer operations
• Integers are very common
• SOME floating point operations are exactly the same as integer operations
• V8 uses 2s complement integers in some cases and floating point numbers in others
• Needs to change representations seamlessly in all cases

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