diff --git a/DoRunner/DefineVariableRunner.cs b/DoRunner/DefineVariableRunner.cs
index 54e92a9..15d10b4 100644
--- a/DoRunner/DefineVariableRunner.cs
+++ b/DoRunner/DefineVariableRunner.cs
@@ -79,7 +79,7 @@ namespace Convention.RScript.Runner
                 if (varTypeName == "string")
                 {
                     varType = typeof(string);
-                    varDefaultValue = varInitExpression == null ? string.Empty : varInitExpression;
+                    varDefaultValue = varInitExpression == null ? string.Empty : varInitExpression.Trim('\"');
                 }
                 else if (varTypeName == "int")
                 {
diff --git a/DoRunner/ExitNamespaceRunner.cs b/DoRunner/ExitNamespaceRunner.cs
index 5303372..bb1e3ec 100644
--- a/DoRunner/ExitNamespaceRunner.cs
+++ b/DoRunner/ExitNamespaceRunner.cs
@@ -22,7 +22,14 @@ namespace Convention.RScript.Runner
             // 还原上层命名空间的变量
             foreach (var local in context.CurrentLocalSpaceVariableNames.Peek())
             {
-                parser.context.Variables[local] = context.Variables[local].data;
+                if (context.Variables.ContainsKey(local))
+                {
+                    parser.context.Variables[local] = context.Variables[local].data;
+                }
+                else
+                {
+                    parser.context.Variables.Remove(local);
+                }
             }
             context.CurrentLocalSpaceVariableNames.Pop();
             // 弹栈
diff --git a/Parser/ExpressionParser.cs b/Parser/ExpressionParser.cs
index 393f390..4e717fa 100644
--- a/Parser/ExpressionParser.cs
+++ b/Parser/ExpressionParser.cs
@@ -97,6 +97,14 @@ namespace Convention.RScript.Parser
             this.context = context;
             // 默认启用未定义标识符作为字符串的功能
             this.context.Options.UndefinedIdentifiersAsStrings = true;
+            // 启用大小写敏感
+            this.context.Options.CaseSensitive = true;
+            // 启用溢出检查
+            this.context.Options.Checked = true;
+#if UNITY_EDITOR
+            // 浮点数使用float而非double（Unity性能优化）
+            this.context.Options.RealLiteralDataType = RealLiteralDataType.Single;
+#endif
         }
 
         private readonly Dictionary<string, Type> CompileGenericExpressionTypen = new();
diff --git a/PublicTypes/RScriptVariables.cs b/PublicTypes/RScriptVariables.cs
index a585855..bcf3555 100644
--- a/PublicTypes/RScriptVariables.cs
+++ b/PublicTypes/RScriptVariables.cs
@@ -32,7 +32,7 @@ namespace Convention.RScript
                     else
                         internalData = Activator.CreateInstance(type);
                 }
-                else if (type == typeof(object) || type == value.GetType())
+                else if (type == typeof(object) || type.IsAssignableFrom(value.GetType()))
                     internalData = value;
                 else
                     internalData = Convert.ChangeType(value, type);