vm: stringify InteropInterface stackitem type as InteropInterface

pkg/vm/stackitem/item.go

@@ -910,7 +910,7 @@ func (i *Interop) Value() interface{} {
 
 // String implements stringer interface.
 func (i *Interop) String() string {
-	return "Interop"
+	return "InteropInterface"
 }
 
 // Dup implements the Item interface.

pkg/vm/stackitem/item_test.go

@@ -126,7 +126,7 @@ var stringerTestCases = []struct {
 	},
 	{
 		input:  NewInterop(nil),
-		result: "Interop",
+		result: "InteropInterface",
 	},
 	{
 		input:  NewPointer(0, nil),

pkg/vm/stackitem/json.go

@@ -299,7 +299,7 @@ func toJSONWithTypes(data []byte, item Item, seen map[Item]sliceNoPointer) ([]by
 	case Null:
 		val = `{"type":"Any"}`
 	case *Interop:
-		val = `{"type":"Interop"}`
+		val = `{"type":"InteropInterface"}`
 	default:
 		val = `{"type":"` + item.Type().String() + `","value":`
 		hasValue = true

pkg/vm/stackitem/json_test.go

@@ -235,7 +235,7 @@ func TestToJSONWithTypes(t *testing.T) {
 			`{"type":"Map","value":[{"key":{"type":"Integer","value":"42"},` +
 				`"value":{"type":"Boolean","value":false}}]}`},
 		{"Interop", NewInterop(nil),
-			`{"type":"Interop"}`},
+			`{"type":"InteropInterface"}`},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
@@ -385,7 +385,7 @@ func TestFromJSONWithTypes(t *testing.T) {
 		item Item
 	}{
 		{"Pointer", `{"type":"Pointer","value":3}`, NewPointer(3, nil)},
-		{"Interop", `{"type":"Interop"}`, NewInterop(nil)},
+		{"Interop", `{"type":"InteropInterface"}`, NewInterop(nil)},
 		{"Null", `{"type":"Any"}`, Null{}},
 		{"Array", `{"type":"Array","value":[{"type":"Any"}]}`, NewArray([]Item{Null{}})},
 	}

pkg/vm/stackitem/type.go

@@ -45,7 +45,7 @@ func (t Type) String() string {
 	case MapT:
 		return "Map"
 	case InteropT:
-		return "Interop"
+		return "InteropInterface"
 	default:
 		return "INVALID"
 	}
@@ -82,7 +82,7 @@ func FromString(s string) (Type, error) {
 		return StructT, nil
 	case "Map":
 		return MapT, nil
-	case "Interop":
+	case "InteropInterface":
 		return InteropT, nil
 	default:
 		return 0xFF, ErrInvalidType