There is no one right answer...

if you return an empty list to mean "false", the false-ish-ness could be lost (or other problems could arise) if your return value is "slurped" into another list context

...

There's no substite for extensively documenting that your method may not work the way people think and making it their responsibility to force the calling context.

In reply to Re^3: Value of a statement with modifier by hossman
in thread Value of a statement with modifier by Jenda

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