Slider mode 3 can cross by keyboard if step is below 1

[GabrielKatz]

Problem or feature description:

If the step is below 1 and not a number that has an exact floating point representation eg. 0.5 or 0.25 (for example, 0.1), then a slider can be moved passed another by keyboard.

Steps to reproduce (for problems):

• create a slider with these parameters:

<Slider mode={3} step={0.1} domain={[0,100]} values={[0, 10.5]}>

• Move left slider with mouse first
• try to move left slider past right slider by keyboard

Versions (for problems):

React-Compound-Slider: v2.2.0

React: 16.8.6

Browser: Chrome 76

Operating System: Windows 10

[sghall]

Hi there. Interesting. I'll have to take a look at this. If anyone wants to do a PR on this issue please let me know. I probably won't look at this until the weekend.