I remember seeing one post where they 'discovered' this. Mind was blown.
Discovered Math.min and Math.max, or discovered how to clamp values in general?
I imagine the mind blowing discovery was finding that an API existed for directly querying the mouse position.
I certainly didn't know it existed.
Though I can't really see too many useful applications for it.
I suppose MouseInfo.getNumberOfButtons() is a useful feature.
I'd have preferred the API exposed direct querying of HID devices, so support for multiple mice/keyboards/etc was possible (without 3rd party APIs)