It seems that when I use a numeric type as a key name in an object, it always gets converted to a string. Is there anyway to actually get it to store as a numeric? The normal typecasting does not seem to work.

Example:

var userId = 1;

console.log( typeof userId ); // number

myObject[userId] = 'a value';

console.dir(myObject);

Dir Output:

{

    '1': 'a value'

}

What I want is this:

{

    1: 'a value'

}

Advice?