>   Has anybody ever thought about extending the usual file-based interfaces
>  with a typechecking ?

It did occur to me one could have:

        echo 10 oranges > /dev/apple-count
        echo: write failed: inapropriate fruit

More seriously one of our researchers once asked me why computer
langages don't allow people to associate variables and constants
with SI units, allowing True type checking; I never managed to
come up with a good answer.

-Steve

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