Function arraytostring

test/test_bigint64array_polyfill.js:61–63

(arr)

result.arr2_subarray = Array.from(arr2.subarray(1, 5));
let reducer = (k, v) => typeof v  === 'bigint' ? v.toString() + 'n' : v;
function arraytostring(arr){
  return JSON.stringify(Array.from(Array.from(arr)), reducer);
}

let sub = arr2.subarray(1, 5);
assertEqual(() => [sub.byteOffset, 8]);