just a proposal to provide this functionality into array, allowing to add / remove items in a toggling mechanism shortcut, avoiding the need to do traversing to locate the indexes and remove them next (i.e. by means of a polyfill or any other approach).
```js [1, 2, 3, 2, 1].toggle(1) // mutates the original array removing 1, resulting in [2, 3, 2] ```
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