The funny thing is that the example in README shows that this library works incorrectly:

  EUR: 1.00
  GBP: 0.92
  
  const result = cashify.convert(10, {from: 'EUR', to: 'GBP'});
  console.log(result); //=> 9.200000000000001

The correct result is 9.2. Due to IEEE floating point precision quirk, the library gives 9.200000000000001.