Use Case: We have a large dataset that is navigated using the slider. I would like to be able to give the user feedback on what item is under the mouse without having them have to click to induce an onChange().

• This is not a v0.x issue.
• I have searched the issues of this repository and believe that this is not a duplicate.

Expected Behavior 🤔

Current Behavior 😯

Examples 🌈

Context 🔦

For now, I've lifted the mouse position utility functions out of slider.js and have baked my own. (It would be nice if those where exported, as well).