But the second you go international that goes out the window. There are currencies with 3 and 4 digits of precision. There are currencies that are integers. Keeping track of that is a nightmare using a numerical value. It’s safest just to represent it as a string.
Or, use the smallest denomination. In the US, that’s typically tenths of a penny. So, $1 = 1000. Then everything uses integer arithmetic.
Of course, JS doesn’t actually have integers, so yeah, strings are probably best.
But the second you go international that goes out the window. There are currencies with 3 and 4 digits of precision. There are currencies that are integers. Keeping track of that is a nightmare using a numerical value. It’s safest just to represent it as a string.