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Got it: thanks! I suppose there's no way to hard-code comma as the separator, but then allow for that to be replaced by ampersand if requested? Or to introduce a new type of list (ampersand-separated) so existing lists would be unaffected (still hard-coded to comma) but users could choose to create lists of the new (ampersand-separated) type if they wished? (Just clutching at straws!)
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