Convert BigInteger to Int64 when possible from Python

src/DynamoUtilities/DataMarshaler.cs

@@ -2,6 +2,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
+using System.Numerics;
 
 namespace Dynamo.Utilities
 {
@@ -86,7 +87,20 @@ public object Marshal(object obj)
             var applicable = marshalers.Where(pair => pair.Key.IsAssignableFrom(targetType));
 
             if (!applicable.Any())
-                return obj;
+            {
+                if (!(obj is BigInteger bigInt)) return obj;
+
+                long int64;
+                try
+                {
+                    int64 = (long)bigInt;
+                }
+                catch (OverflowException)
+                {
+                    return bigInt;
+                }
+                return int64;
+            }
 
             // Find the marshaler that operates on the closest base type of the target type.
             var dispatchedMarshaler =

src/DynamoUtilities/DynamoUtilities.csproj

@@ -49,6 +49,7 @@
     <Reference Include="System" />
     <Reference Include="System.configuration" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Numerics" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />