Support for FSharpSet<T> (#92)

* EnumerableSerializeFactory fixes

* Update EnumerableSerializerFactory. Move null checks outside ObjectReader, allow private constructors.

* Update EnumerableSerializerFactor to use Add method if exists, then IEnumerable<T> ctor.

* Check for parameterless constructor before calling Activator.CreateInstance in EnumerableSerializerFactor

* Test serialization of FSharpList<T>

* Fix merge issues

* Fix merge issues

* Fix type in FSharpTests.cs

Author: joey-becker

src/Hyperion.Tests/FSharpTests.cs

@@ -44,6 +44,16 @@ public void CanSerializeFSharpList()
             Assert.Equal(expected, actual);
         }
 
+        [Fact]
+        public void CanSerializeFSharpSet()
+        {
+            var expected = SetModule.OfArray(new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 });
+            Serialize(expected);
+            Reset();
+            var actual = Deserialize<object>();
+            Assert.Equal(expected, actual);
+        }
+
         [Fact]
         public void CanSerializeSimpleDU()
         {

src/Hyperion/SerializerFactories/EnumerableSerializerFactory.cs

@@ -139,7 +139,7 @@ public override ValueSerializer BuildSerializer(Serializer serializer, Type type
 
             Func<object, int> countGetter = o => (int)countProperty.GetValue(o);
             ObjectReader reader = null;
-            if (addMethod != null)
+            if (HasParameterlessConstructor(type) && addMethod != null)
             {
                 var add = CompileMethodToDelegate(addMethod, type, elementType);
                 reader = (stream, session) =>