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[Don W]

Is it possible to define the return value of an expression such that the display treats it as a List?

Here's what I mean: Suppose I group by the field "Artist", which is a user field of type List. If a track has value for Artist = "A; B" then it shows up in both group "A" and group "B". Importantly, a group named "A; B" is not created. However, if I create an expression which simply returns  [Artist] and group by that expression, then the track doesn't show up in either "A" or "B", but instead shows up in "A; B". This is true for expressions and "calculated" fields.

[MrC]

For calculated expressions, add &datatype=[list] at the end of the expression to cast it into a list type.

[Don W]

Perfect! Thanks!