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[Power Query] Replace an unary function type with a custom type that contains metadata for allowed parameter values
(f as function, allowedValues as list)=>
let
//create a new parameter type with metadata for allowed values
parameterType = Value.Type(allowedValues{1}) meta [Documentation.AllowedValues = allowedValues],
//create a function type with custom parameter type
myFunType = type function (select as parameterType) as function
in //replace the orginal function type with the new myFunType
Value.ReplaceType(f,myFunType)
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