No documentation about asIntN() and asUintN() methods

[ppKrauss]

Hi, there are some documentation about how BigInteger wraps the signal of a number?

As (2018) "BigInt is being added as a native feature of JavaScript. This library now works as a polyfill", is important to check how is orking about it.

See https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/BigInt#Methods