Array passed as labels option is modified by Chart.js

### Expected behavior

When passing an array of labels I do not expect Chart.js to modify that array, but instead use a copy of it.

### Current behavior

Values in the array are different after Chart.js was run.

### Reproducible sample

https://jsfiddle.net/tsrabmgo/

### Optional extra steps/info to reproduce

See difference with and without the array_var line commented/uncommented.

### Possible solution

Call .slice() on the value received as labels array.

### Context

_No response_

### chart.js version

latest

### Browser name and version

_No response_

### Link to your project

_No response_