I oppose the Symbol approach. It makes code looks ugly just for adding write
access. There is already a `.push()`, and we only need to add `.last()` or
`.back()` to make it complete.
> From: [email protected]
> If it comes to write access, I agree that`Symbol.last` could be another
> handy
> addition (it doesn't have to be an "either/or" discussion, really):
>
> [1, 2, 3][Symbol.last]; // 3
> [1, 2, 3][Symbol.last] = 4; // 4
> [1, 2, 3].last(1); // 2
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