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If we really cared we'd only ship data and not code

That's assuming that parsers don't have bugs in them.

Code is data. There is no technical difference, only human interpretative models.

He's obviously talking about shipping only non-executable data.

Correct

Still, is there a difference? If there is a bug in the parser, trip it and what was once non-executable might be executable.

Yes. Without executable client side code you can't do things like heap spraying.

Oh, you totally can. You just have to do it by tricking the parser into going it for you.