>  You can just keep executing JavaScript code in the context of a browser
window after page load and it will just evaluate.

Oh, so it is as simple as defining a function over again?  Will references
to the old function stay pointed to the old function and any closure?  So
callbacks stored away will still call the old one?

If so, then you will have old and new running at the same time.  I guess
this is reality and one will just have to be careful with changes.  Of
course one would have to be careful with changes in any live-change
scenario.

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