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> If my model logic is happy to be modified by any page, and if there's a bug in my model logic, then I have no idea where to look.

I don't mean this sarcastically (hard to convey tone in written form), but is this genuinely something you have encountered with Elm in practice? Even with the time-travelling debugger?

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No. Like I said, I've only worked on one Elm app, and that one doesn't let model logic be modified by any page (with some well-defined exceptions). But it's what I'd expect to sneak in if we hadn't architectured it to forbid that kind of thing. I agree that the time-travel debugger would help, but... I guess, even if that makes it less costly, I'm not seeing the benefits.

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