XL 2019 Power query - modifier le type des colonnes

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("XYvBDcAwCAN34W0pmJC0mYWw/xrNp1Lp887nCFe4Y3WI+W5qu5maC9aAsJhfINZLnwhiDtyEKL/TEcZ61YrzIF+8mPkA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Nombre 1 = _t, Nombre 2 = _t, Nombre 3 = _t, Date 1 = _t, Nombre 4 = _t, Date 2 = _t, Date 3 = _t, Date 4 = _t, Nombre 5 = _t]),
    transformationsList = {{each Text.StartsWith(_, "Nombre"), type number}, {each Text.StartsWith(_, "Date"), type date}},
    ChangeTypes = 
        let
            colNames = List.Buffer(Table.ColumnNames(Source)),
            transformations = List.Combine(List.Transform(transformationsList, each let current = _, columns = List.Select(colNames, current{0}) in List.Transform(columns, each {_, current{1}})))
        in
            Table.TransformColumnTypes(Source, transformations)
in
    ChangeTypes

let
    DefModifTypes =
        let
            Noms_colonnes = Excel.CurrentWorkbook(){[Name="Noms_cols"]}[Content][Column1],
            Type_colonne = Excel.CurrentWorkbook(){[Name="Types_cols"]}[Content][Column1]
        in
            List.Zip({Noms_colonnes, List.Transform(Type_colonne, Expression.Evaluate)}),
    Source = Excel.CurrentWorkbook(){[Name="Tableau1"]}[Content],
    TypesModifiés = Table.TransformColumnTypes(Source,DefModifTypes)
in
    TypesModifiés

let
    Source = Excel.CurrentWorkbook(){[Name="Tableau1"]}[Content],
    ModType = Table.TransformColumnTypes(Source,List.Zip({T_Types[Colonne],List.Transform(T_Types[Type],Expression.Evaluate)}))
in
    ModType

let
    Erreur = Expression.Evaluate("Int64.Type"),
    SansErreur1 = Expression.Evaluate("Int64.Type", [Int64.Type = Int64.Type]),
    SansErreur2 = Expression.Evaluate("Int64.Type", #shared),
    WTF = Expression.Evaluate("List.Max({1, 9})", [List.Max = List.Min])
in
    WTF