I think you will note that many of the "built in" methods in the spec are already implemented in JavaScript code in many implementations (v8, firefox). Similarly the ability to implement more fundamental features in terms of macro definitions may well be pursued by the implementations. But note that the spec does not *mandate* that these built-ins are defined 'natively' in JavaScript (the spec does not use JavaScript to define the required behavior), and I would expect that macros would be treated similarly: that is, the spec definitions will not be written as applications of macros, but implementations are free to use macros to implement them were appropriate.
I would certainly expect a macro proposal to be evaluated more favorably if it were powerful enough to allow some implementation refactoring of this sort. And in fact, I wouldn't be surprised for a successful macro proposal to have been prototyped in the implementation of one of the major engines. This is not an official position, of course. But I believe you can use history as a guide. --scott
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