Multiple doesn't handle floats correctly

[LinusU]

e.g.

const iz = require('iz')
const validators = require('iz/lib/validators')

iz.register(validators)

console.log(iz(2.3).multiple(0.01).valid)

logs false instead of true.

This is because 2.3 % 0.01 is 0.009999999999999775 in JavaScript 🤦‍♂️

[parris]

Ahhh fun - sorry about that. Is there a validator you added manually as a workaround? Did you come up with a solution? Should we add that back into iz?

[LinusU]

I started exploring this due to mafintosh/is-my-json-valid#172. It seems like the implementation in is-my-json-valid works:

https://github.com/mafintosh/is-my-json-valid/blob/dcea5be83be29ea444c81bd83e7aef732a11c003/index.js#L100-L110

[parris]

@LinusU do I have permission to use that code in iz - with some tweaks and tests? Planning on making a new validator for multiples of floats.

[parris]

I'm going to assume the answer is yes :). Let me know if the implementation needs to be different.

[LinusU]

Absolutely, the code is MIT licensed!