Remove Array.at

## Suggestion Hey, we came across the issue of clients not supporting `Array.at` ([MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at)), which this library utilizes. The number of clients not supporting it was so significant, that we can not use this library at the moment without polyfills, which we would like to avoid due to the additional complexity. It seems a new-ish feature, that Safari only got in May 2022 according to [caniuse](https://caniuse.com/mdn-javascript_builtins_array_at). I would kindly request using an alternative method with broader browser support.