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And I see it's appeared in release 0.7.32.
One small issue. though, is that the "number" produced by count() seems to be treated as text, rather than an integer, for sorting purposes meaning that "{authors:count(&)}" can't be sorted numerically.
This can be worked around by using a second custom column with "{#numauthors:0>2s}" but is there any way to have the whole thing done in a single field (i.e. so the output is "01","02,"03",etc) or to make the numbers in such a column be sorted as numbers, rather than as text?
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