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With this definition a cable can be computer; or a lightbulb.

You can definitely send instructions to a lot of modern devices that would have not integrated such a powerful chipset decade ago: not only the toaster you are referring to, but a fridge, a wash machine, a tv, a light bulb, a door bell. The list goes on and on, as long as a new product is brought to market that integrate a processor and brand itself as "smart" there is a good change a computer has been blended in what otherwise would be a dumb device with a single purpose.

Does the law apply to the old human computers back in the day too.