In typescript-to-lua 1.37.1 targeting Lua 5.3+, integer-valued numeric literals above Number.MAX_SAFE_INTEGER (2^53 - 1) are formatted with JavaScript's String(value) without a decimal point or exponent. Because String() rounds to 16–17 significant digits while omitting .0, Lua 5.3+ parses the output as a 64-bit integer with a different value than the original IEEE-754 double.

const a = 4611686018427387904; // 2 ** 62 (exact IEEE-754 double)
console.log(a === 2 ** 62);
console.log(a % 1000);

Transpiling with luaTarget: "5.4" emits a = 4611686018427388000, and running on Lua 5.3+ prints false and 0, whereas Node.js (and Lua 5.1/5.2/LuaJIT, where all numbers are floats) prints true and 904. In Lua 5.3+, 4611686018427388000 is parsed as an exact 64-bit integer that is 96 larger than 2^62, so a == 2 ^ 62 evaluates to false under Lua's exact integer-float comparison.

Credit: https://ucsbplse.github.io/