How to properly describe the type of the rest parameter using array union?

Question

typescript

Code example:

function func1(...args: string[] | number[]) {
    //...
}

Error text:

error TS2370: A rest parameter must be of an array type.

I don't need the following code, because my function input will be
either an array of strings or an array of numbers, but not mixed in any way - an array of numbers or strings.

function func1(...args: (string | number)[]) {
    //...
}