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Update down-the-stack-book/src/the_hal.md

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Co-authored-by: Tanks Transfeld <Mirabellensaft@users.noreply.github.com>
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@ -74,7 +74,7 @@ This differs widely across MCUs (ST, Nordic, Espressif, Atmel, etc). Some MCUs (
## Correctness by design
* HALs want to make it hard to do the wrong thing
* Is a UART driver any use, if you haven't configured at least one TX pin and one RX pin?
* Is a UART driver of any use, if you haven't configured at least one TX pin and one RX pin?
* Should the UART driver check you've done that?
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