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I’m using a server-side calculation which needs to generate (with * and + operations) and compare 40-bit integers. I’m aware that at that point the V8 engine stores the numbers as Double rather than int. Can I rely on these numbers to be generated and compared correctly?
My intuition says yes – doubles shouldn’t have trouble with that – but I’m not sure how to check or where to find information on this.
Yes.
A JavaScript
Number, which is a 64-bit IEEE 754 floating point value, can store integers from -253 to 253 without loss of precision, since doubles can store up to 53 bits of mantissa (52 explictly).References:
ECMA-262: 4.3.19 Number value
Double-precision floating point numbers (Wikipedia)