These numbers look incorrect:

const minUint53 = 0
const maxUint53 = 4503599627370495
const minInt53 = -2251799813685248
const maxInt53 = 2251799813685247

The signed integer range should be -9007199254740991 to 9007199254740991. The unsigned ones should also be shifted appropriately.

See https://tc39.es/ecma262/#sec-number.min_safe_integer and https://tc39.es/ecma262/#sec-number.min_safe_integer.