Potential bug in mod()

Hi,

**Describe the bug**
`mod()` sometimes returns an unexpected result, presumably due to round-off errors.

**To Reproduce**

Please compare:

```
mod(0.15, 0.05) 
// Actual result: 0.04999999999999999; 
// Expected result: 0
```

with

```
0.15 - 0.05 * floor(0.15 / 0.05) == 0
// Actual result: true
// Expected result: true
```

Version tested: 11.8.0

Best regards,