Data fields are now private

Assets/Fungus/VisualScripting/BooleanVariable.cs

@@ -19,8 +19,11 @@ namespace Fungus.Script
 	[System.Serializable]
 	public class BooleanData
 	{
-		public BooleanVariable booleanReference;
-		public bool booleanValue;
+		[SerializeField]
+		BooleanVariable booleanReference;
+
+		[SerializeField]
+		bool booleanValue;
 
 		public bool Value
 		{

Assets/Fungus/VisualScripting/FloatVariable.cs

@@ -18,8 +18,11 @@ namespace Fungus.Script
 	[System.Serializable]
 	public class FloatData
 	{
-		public FloatVariable floatReference;
-		public float floatValue;
+		[SerializeField]
+		FloatVariable floatReference;
+
+		[SerializeField]
+		float floatValue;
 
 		public float Value
 		{

Assets/Fungus/VisualScripting/IntegerVariable.cs

@@ -18,8 +18,11 @@ namespace Fungus.Script
 	[System.Serializable]
 	public class IntegerData
 	{
-		public IntegerVariable integerReference;
-		public int integerValue;
+		[SerializeField]
+		IntegerVariable integerReference;
+
+		[SerializeField]
+		int integerValue;
 
 		public int Value
 		{

Assets/Fungus/VisualScripting/StringVariable.cs

@@ -18,8 +18,11 @@ namespace Fungus.Script
 	[System.Serializable]
 	public class StringData
 	{
-		public StringVariable stringReference;
-		public string stringValue;
+		[SerializeField]
+		StringVariable stringReference;
+
+		[SerializeField]
+		string stringValue;
 
 		public string Value
 		{