diff --git a/tools/exp/props/funcprop.go b/tools/exp/props/funcprop.go
index b3b8d92..c138741 100644
--- a/tools/exp/props/funcprop.go
+++ b/tools/exp/props/funcprop.go
@@ -321,9 +321,7 @@ func (p *FunctionalPropertyGenerator) serializationFuncs() (*codegen.Method, *co
 			jen.List(
 				jen.Id("v"),
 				jen.Err(),
-			).Op(":=").Add(kind.DeserializeFn.Clone().Call().Call(
-				jen.Id("i"),
-			)),
+			).Op(":=").Add(kind.deserializeFnCode(jen.Id("i"))),
 			jen.Err().Op("!=").Nil(),
 		).Block(
 			jen.Id(codegen.This()).Op(":=").Op("&").Id(p.StructName()).Values(
@@ -844,7 +842,7 @@ func (p *FunctionalPropertyGenerator) addUnknownDeserializeCode(existing jen.Cod
 			),
 			jen.Return(
 				jen.Id(codegen.This()),
-				jen.Err(),
+				jen.Nil(),
 			),
 		),
 	)
diff --git a/tools/exp/props/manager.go b/tools/exp/props/manager.go
index 99f0a3f..486e93b 100644
--- a/tools/exp/props/manager.go
+++ b/tools/exp/props/manager.go
@@ -201,7 +201,7 @@ func (m *ManagerGenerator) createDeserializationMethod(deserName string, pubPkg,
 		/*param=*/ nil,
 		[]jen.Code{
 			jen.Func().Params(
-				jen.Map(jen.String()).Interface(),
+				jen.Interface(),
 			).Params(
 				jen.Qual(pubPkg.Path(), interfaceName),
 				jen.Error(),
@@ -210,7 +210,7 @@ func (m *ManagerGenerator) createDeserializationMethod(deserName string, pubPkg,
 		[]jen.Code{
 			jen.Return(
 				jen.Func().Params(
-					jen.Id("m").Map(jen.String()).Interface(),
+					jen.Id("v").Interface(),
 				).Params(
 					jen.Qual(pubPkg.Path(), interfaceName),
 					jen.Error(),
@@ -218,7 +218,7 @@ func (m *ManagerGenerator) createDeserializationMethod(deserName string, pubPkg,
 					jen.List(
 						jen.Id("i"),
 						jen.Err(),
-					).Op(":=").Qual(privPkg.Path(), deserName).Call(jen.Id("m")),
+					).Op(":=").Qual(privPkg.Path(), deserName).Call(jen.Id("v")),
 					jen.Return(jen.List(
 						jen.Id("i"),
 						jen.Err(),
diff --git a/tools/exp/props/property.go b/tools/exp/props/property.go
index 1d2bb93..d1b139b 100644
--- a/tools/exp/props/property.go
+++ b/tools/exp/props/property.go
@@ -96,6 +96,17 @@ func (k Kind) lessFnCode(this, other *jen.Statement) *jen.Statement {
 	return lessCall
 }
 
+func (k Kind) deserializeFnCode(this *jen.Statement) *jen.Statement {
+	// LessFn is not nil, this means it is a value.
+	if k.LessFn != nil {
+		return k.DeserializeFn.Clone().Call(this)
+	} else {
+		// If LessFn is nil, this means it is a type. Which requires an
+		// additional Call.
+		return k.DeserializeFn.Clone().Call().Call(this)
+	}
+}
+
 // PropertyGenerator is a common base struct used in both Functional and
 // NonFunctional ActivityStreams properties. It provides common naming patterns,
 // logic, and common Go code to be generated.
diff --git a/tools/exp/props/type.go b/tools/exp/props/type.go
index 6eb4a19..412b48c 100644
--- a/tools/exp/props/type.go
+++ b/tools/exp/props/type.go
@@ -645,9 +645,10 @@ func (t *TypeGenerator) kindDeserializationFunc() (deser *codegen.Function) {
 	deser = codegen.NewCommentedFunction(
 		t.PrivatePackage().Path(),
 		t.deserializationFnName(),
-		[]jen.Code{jen.Id("m").Map(jen.String()).Interface()},
+		[]jen.Code{jen.Id("i").Interface()},
 		[]jen.Code{jen.Op("*").Id(t.TypeName()), jen.Error()},
 		[]jen.Code{
+			// TODO: Assertion that interface is a map.
 			jen.Id(codegen.This()).Op(":=").Op("&").Id(t.TypeName()).Values(jen.Dict{
 				jen.Id(unknownMember): jen.Make(jen.Map(jen.String()).Interface()),
 			}),