On 2009-09-04, at 13:24, Brendan Eich wrote:
I hope it doesn't break anything on the web. It could, because using for-in to inspect properties and extend base objects with copies of them is standard practice (Doug's "Swiss inheritance", search for "Swiss" in http://www.cosmik.com/aa-october99/stan_freberg.html).
One small datapoint: OpenLaszlo does not expect enumerability of function prototypes. We learned by trial and error that browsers varied and work around that for both inspecting and extending.
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