Array - join and toString calls return an empty string after toLocaleString call

Question

I'm not getting the point why calls to the join and toString methods on an Array object return an empty string after a call to toLocaleString:

let A = [1, 2, 3];
A.toString(); => "1,2,3"
A.join(); => "1,2,3"
A => (3) [1, 2, 3]
A.toLocaleString(); => ""
A.toString(); => ""
A.join(); => ""
A => (3) [1, 2, 3]

I'm trying on Google Chrome 73.0.3683.103, on Firefox I don't experience the same issue.

Answer 1

This is a bug

To fix this issue, you can use this way:

[...A].toLocaleString();

//or

[].concat(A).toLocaleString();