I agree. I think a high level programming language like JavaScript should default to the more "correct" (least surprising) behaviour, and let the programmer opt

I agree. I think a high level programming language like JavaScript should default to the more "correct" (least surprising) behaviour, and let the programmer opt in to floating point numbers when needed for performance. In modern JavaScript, you can use BigInt literals by suffixing an n, like this: const maxPlusOne = 9007199254740992n; If I could magically redesign the language, I would make all integer literals be effectively BigInt values, and I would make all decimal literals be effectively decimal values so that 0.1 + 0.2 === 0.3. I would reserve the letter suffixes for more performant types like 64-bit floating point numbers that have surprising behaviour.