Aside from the JSON example of populating a dropdown list given (which I will agree is a real if contrived use case), there has been a lot of talk of "thousands of web developers" depending on preserving insertion order, but not one concrete example -- do you have one?
Two examples I've seen recently in projects, both relying primarily on the for-in iteration order of an object:
1. exporting objects (like JSON, etc) to log files (server-side javascript)... needing a reliable order for the keys to be printed to the log file output, like the "datetime" field first, etc. A variation on this is using JSON.stringify(obj) and wanting the JSON output to have a reliable output order, also for log files.
2. Using an object literal as a UI/form "configuration" where a each field of the object represents a form element in a form-builder UI. If the iteration order of the object is different in different engines/browsers, the UI ends up being displayed in different orders.
--Kyle
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