> This contrasts with JavaScript number values, which have the well-known property of only being able to precisely represent integers between -2⁵³ and 2⁵³. JS'

> This contrasts with JavaScript number values, which have the well-known property of only being able to precisely represent integers between -2⁵³ and 2⁵³. JS's Number can represent way more integers than just those between -2⁵³ and 2⁵³. There's a great StackOverflow answer[1] that answers a similar question, ("What is the biggest "no-floating" integer that can be stored in an IEEE 754 double type without losing precision?") which also applies here (A JS Number is an IEEE double): > The biggest/largest integer that can be stored in a double without losing precision is the same as the largest possible value of a double. That is, DBL_MAX or approximately 1.8 × 10³⁰⁸ (if your double is an IEEE 754 64-bit double). It's an integer. It's represented exactly. What more do you want? > Go on, ask me what the largest integer is, such that it and all smaller integers can be stored in IEEE 64-bit doubles without losing precision. An IEEE 64-bit double has 52 bits of mantissa, so I think it's 2⁵³: More seriously, this is great news, and I think it'll be nice to have such a numeric type in JS. [1]: https://stackoverflow.com/a/1848762 https://stackoverflow.com/a/1848762