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CastError when adding picture using addStream on syncfusion_flutter_xlsio 20.4.50-beta

Hi, i got 

_CastError (type 'CastList' is not a subtype of type 'Uint8List' in type cast) when adding picture (List<int>) using addStream()

This happen on syncfusion_flutter_xlsio 20.4.50-beta

But, it work on syncfusion_flutter_xlsio-20.4.44-beta

I notice 

20.4.50-beta casting imageData as 
Uint8List while
 20.4.44-beta didn't cast, as you can see in the pictures below.

Thanks