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What would be some real use cases for this (except for the fun part of it) ?

"For science!"

maybe if you build urls to images that are hard to parse with the eye as text only

Or if you're doing some sort of multi-stage manipulation of a <canvas>, you could log out intermediate states.

It's a stretch, I know.

Or he's just trying to make Chrome behave more like the Lisp Machines.

Actually, if you could port that to Node.js, and call Node from the shell...