@@ -882,17 +882,26 @@ private static bool ToArray(IntPtr value, Type obType, out object result, bool s
882882// See https://docs.microsoft.com/en-us/dotnet/api/system.type.makegenerictype#System_Type_MakeGenericType_System_Type
883883var constructedListType = typeof ( List < > ) . MakeGenericType ( elementType ) ;
884884bool IsSeqObj = Runtime . PySequence_Check ( value ) ;
885+ object [ ] constructorArgs = Array . Empty < object > ( ) ;
885886if ( IsSeqObj )
886887{
887888var len = Runtime . PySequence_Size ( value ) ;
888- list = ( IList ) Activator . CreateInstance ( constructedListType , new Object [ ] { ( int ) len } ) ;
889- }
890- else
891- {
892- // CreateInstance can throw even if MakeGenericType succeeded.
893- // See https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance#System_Activator_CreateInstance_System_Type_
894- list = ( IList ) Activator . CreateInstance ( constructedListType ) ;
889+ if ( len >= 0 )
890+ {
891+ if ( len <= int . MaxValue )
892+ {
893+ constructorArgs = new object [ ] { ( int ) len } ;
894+ }
895+ }
896+ else
897+ {
898+ // for the sequences, that explicitly deny calling __len__()
899+ Exceptions . Clear ( ) ;
900+ }
895901}
902+ // CreateInstance can throw even if MakeGenericType succeeded.
903+ // See https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance#System_Activator_CreateInstance_System_Type_
904+ list = ( IList ) Activator . CreateInstance ( constructedListType , args : constructorArgs ) ;
896905}
897906catch ( Exception e )
898907{