After upgrading apache-arrow in #180 (which was needed to fix #150), this library stopped working in some Nodejs versions. Turns out that apache-arrow@13 started to massively use Array.at/TypedArray.at methods which became available only in Node@16.6.0.

Even if we forget that apache-arrow declares a support for Node@12 (at least in its package.json file), we had two options:

1. stop supporting older Nodejs versions;
2. add polyfills for missing methods.

I ended up implementing own polyfill with this reasoning:

1. we still have users that use Node 16 or even 14 (but for option 1 we'd have to declare support for even newer versions);
2. basically, only one method is currently needed (Array.at/TypedArray.at can use same implementation);
3. the needed method is really simple (so even using core-js would be absolute overkill).