Is a javascript object's toString function affected by localisation?

Question

This might be a very silly question, but can I rely on the toString() function regardless of the language settings of a client?

That is, for me:

x = true;
x.toString();  // "true"

If someone from France ran my application, would the output be "true" or "vrai"?

Answer 1

For booleans, a conforming ECMAScript interpreter must convert true to "true" and false to "false" (§9.8 and §15.6.4.2).