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This is nice @Collin_Schwantes, I like the [^,]
For a rollup you’d need to convert it into a string and add the separators
IF(
LEN(ARRAYJOIN(ARRAYUNIQUE(values),',')&"") > 0,
LEN(REGEX_REPLACE(ARRAYJOIN(ARRAYUNIQUE(values),',')&"","[^,]",""))+1,...