[XMLHttpRequest] readyState values should be available as named constants of the XMLHttpRequest constructor

[Geoffrey Garen]

Hi folks.
I would like to suggest making the canonical readyState values  
available as named constants of the XMLHttpRequest constructor, like so

     0 UninitializedReadyState
     1 OpenReadyState
     2 SentReadyState
     3 ReceivingReadyState
     4 LoadedReadyState

This code

     if (request.readyState == XMLHttpRequest.OpenReadyState) { ... }

is more readable to me that this code

     if (request.readyState == 1) { ... }

which uses a magic number. The DOM 3 APIs tend to use named constants  
like this.

Thanks,
Geoff Garen