How to pass discontinuous range of cells from Excel to ExcelDNA function

Consider such ExcelDNA function definition:

[ExcelFunction(Name = "Fnc1", Description = "Fnc1")]
public static object Fnc1(
    [ExcelArgument(Name = "Arg1", Description = "Arg1", AllowReference = true)]
    object rng)
{
    // ...
}

• It works fine when called with a single cell like this =Fnc1(A1) or with continuous range of cells like this =Fnc1(A1:A3).
• But it doesn't work when called with discontinuous range of cells e.g. =Fnc1(A1,A5,A10). The error #VALUE! is returned.

Is there a way how to call ExcelDNA function with discontinuous range of unknown amount of cells?

I have tryied to declare the paramter like this params object[] rng but no luck as well.