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* Lorenzo Donati:

> Maybe I'm missing something, but IMHO the manual is not clear about it.

I just can repeat myself: based on my reading, the no-results case is
covered by the manual, in the excerpts as I quoted.  It's not a formal
document, but the formulation "no adjustment is made" pretty clearly
indicates that the no-arguments case is intentionally observable.
(It's also visible to the C API, so it's not just select("#"))t.