One cannot pound that particular drum enough. "Guardrails" in instructions (and all MD files are just instructions) are like price lists at an unattended farm stand. It'll usually work! There will be some money in the basket at the end of the day! People paid for the bagels[0]! But one cannot never assert that it _will_ work; things that _must_ work have to managed out-of-band

[0] https://pubs.aeaweb.org/doi/pdfplus/10.1257/0002828067772121...