How to set value to ArraySchema at specific index?

[meSerge8]

Code example:

import { Schema, type, ArraySchema } from "@colyseus/schema";

export class SomeSchema extends Schema {
    @type(["number"]) nums: ArraySchema<number> = new ArraySchema<number>();
    constructor() {
        super();
        this.nums[2] = 322
        console.log(this.nums[0])
        console.log(this.nums[1])
        console.log(this.nums[2])
    }
}

Result:

322
undefined
undefined

Expected:

undefined
undefined
322

How can I specify the index when setting value into ArraySchema
Also I tried this.nums.setAt(2, 322) and this.nums.at(0) , but result is the same