Existential Operator / Null Propagation Operator

[Claude Pache]

> Le 30 oct. 2015 à 00:07, Waldemar Horwat <waldemar at google.com> a écrit :
> 
>> On 10/29/2015 14:20, Claude Pache wrote:
> 
>> In some cases – as in `3..toStrign()` –, `undefined` will be produced where an error was thrown.
> 
> 
> No, this would continue to throw an error.

Oops, you're right. So, `..` is 100% backward-compatible. 

—Claude