for-in evaluation order

[Michael Day]

Hi,

Some quick testing with Firefox seems to show that for-in returns 
properties in the order they were added to the object, and some scripts 
on the web (eg. RaphaelJS) seem to depend on that, unless I'm 
horrendously misinterpreting them. This seems... bad?

Are objects implicitly ordered, by implementation convention?

Cheers,

Michael

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