export function asinh(arg: number): number {
  //      discuss at: https://locutus.io/php/asinh/
  // parity verified: PHP 8.3
  //     original by: Onno Marsman (https://twitter.com/onnomarsman)
  //       example 1: asinh(8723321.4)
  //       returns 1: 16.67465779841863

  return Math.log(arg + Math.sqrt(arg * arg + 1))
}