DataFrame with mix types

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How can I create a dataframe with only one row composed by a Vector and a Int . When I do DataFrame(a=[1,2,3],b=1) the result dataFrame is a 3x2 DataFrame of Ints.

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julia> DataFrame(:a => [ [1,2,3] ],:b => 1)
1×2 DataFrame
 Row │ a          b
     │ Array…     Int64
─────┼──────────────────
   1 │ [1, 2, 3]      1
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