let data = [];
let len = 200000
for (let i = 0; i < len; i++) {
    x[i] = i;
}

let dataAsText = data.map((e) => {
    return String.fromCodePoint(e);
}).join('');

let dataBack = dataAsText.split('').map((e) => {
    return e.codePointAt(e);
});
console.log(dataBack.length);

console.log(String.fromCodePoint("150000").codePointAt(0));

console.log(String.fromCharCode("150000").charCodeAt(0));

let dataBack = [...dataAsText].map((e, i) => {
   // etc.