@@initialize, or describing subclassing with mixins

[Boris Zbarsky]

On 6/30/14, 3:38 PM, Jussi Kalliokoski wrote:
> On Mon, Jun 30, 2014 at 10:16 PM, Boris Zbarsky <bzbarsky at mit.edu
>     Would it help the discussion if UA implementors described how they
>     solve these problems now?
>
> Yess, please! +9999

https://ask.mozilla.org/question/850/how-do-webidl-methodsgetterssetters-tell-whether-objects-are-of-the-right-types/?answer=851#post-id-851 
for Gecko.

I'd be curious to hear what other UAs do.

> As I suggested in one approach, for "natural" instances (in lack of a
> better word) of Nodes can have all the in-memory layout optimizations
> they need.

Some of these are not just optimizations; some of these are needed for 
correctness.  For example, we use fixed parts of the object layout to 
cache values for some Web IDL properties that need to keep returning the 
same thing over and over again.

-Boris