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AspClassic.Scripting/Runtime/BaseSymbolDictionary.cs

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+namespace AspClassic.Scripting.Runtime;
+
+internal abstract class BaseSymbolDictionary
+{
+	private const int ObjectKeysId = -2;
+
+	private static readonly object _nullObject = new object();
+
+	internal static readonly SymbolId ObjectKeys = new SymbolId(-2);
+
+	public static object NullToObj(object o)
+	{
+		if (o == null)
+		{
+			return _nullObject;
+		}
+		return o;
+	}
+
+	public static object ObjToNull(object o)
+	{
+		if (o == _nullObject)
+		{
+			return null;
+		}
+		return o;
+	}
+
+	public static bool IsNullObject(object o)
+	{
+		return o == _nullObject;
+	}
+}