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``` % pandoc -t native -s -M title=New % Old ^D Pandoc (Meta {unMeta = fromList [("title",MetaString "New")]}) [] ``` ``` % pandoc -t native -s -M foo=1 -M foo=2 ^D Pandoc (Meta {unMeta = fromList [("foo",MetaList [MetaString "1",MetaString "2"])]}) [] ```