Change event of an input spinner triggers the change events of all other input spinners

[DamienLaw]

Version: 2.2.0
Steps to reproduce:

1. Create 2 input spinners
2. Attach change event handlers to both spinners

$("#spinnerA").change(function () {
    console.log("Hello");
});
$("#spinnerB").change(function () {
    console.log("World");
});

3. Click on either one of the spinners' button (up or down).
4. The console will print both Hello and World.

Expected result(s):
The console should only print EITHER Hello or World depending on which button of which spinner is clicked. NOT both.

One version prior (2.1.2) doesn't have this issue.