Array.prototype.at polyfill works inconsistent with spec.

[stonechoe]

The following code works different in node 15 and 16:

 const at = require('core-js-pure/actual/array/at');
at({ length: BigInt("-10") }, 0)

Running node v16.20.2 (npm v8.19.4)
TypeError: Cannot convert a BigInt value to a number

Running node v15.14.0 (npm v7.7.6)
undefined

[zloirock]

It's an interesting case, thanks. I'm pretty sure that some other similar edge cases are not good with bigints at least since they were written before bigints were added to the standard -)