diff --git a/README.md b/README.md
index 6b66b64..46f9054 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# @antv/expr
+# @antv/expr ![gzip size](https://img.badgesize.io/https://unpkg.com/@antv/expr/dist/index.esm.js?compression=gzip)
 
 Have you ever wanted to make your SSR charts more dynamic but worried about security risks?
 
@@ -9,7 +9,7 @@ We've got you covered! Our solution introduces an easy-to-use template syntax th
 - 🔒 **Secure by default** - No access to global objects or prototype chain, does not use `eval` or `new Function`.
 - 🚀 **High performance** - Supports pre-compilation of expressions for improved performance with repeated evaluations.
 - 🛠️ **Extensible** - Register custom functions to easily extend functionality.
-- 🪩 **Lightweight** - Zero dependencies, small footprint, only `7.8 Kb` before gzip.
+- 🪩 **Lightweight** - Zero dependencies, small footprint, before gzip it was less than `8 Kb`.
 
 
 ## 📥 Installation
diff --git a/package.json b/package.json
index d1e5288..ecb919e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@antv/expr",
-	"version": "1.0.0",
+	"version": "1.0.1",
 	"description": "A secure, high-performance expression evaluator for dynamic chart rendering",
 	"main": "dist/index.cjs.js",
 	"module": "dist/index.esm.js",
@@ -10,7 +10,7 @@
 		"build": "rollup -c",
 		"test": "vitest run --coverage",
 		"benchmark": "vitest bench",
-		"prepublishOnly": "npm run build"
+		"prepublishOnly": "pnpm run test && pnpm run build"
 	},
 	"keywords": [
 		"expression",
diff --git a/src/index.ts b/src/index.ts
index 2ee88f7..0c111c2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -48,16 +48,13 @@ function compile(
 	// biome-ignore lint/suspicious/noExplicitAny: Return type depends on the expression
 	return (context: Context = {}): any => {
 		try {
-			// Execute the evaluation with timeout protection
 			return evaluateAst(ast, interpreterState, context);
 		} catch (error) {
 			if (error instanceof ExpressionError) {
 				throw error;
 			}
 
-			if (error instanceof Error) {
-				throw new ExpressionError(error.message);
-			}
+			// Pass through other errors without wrapping them
 			throw error;
 		}
 	};
diff --git a/src/interpreter.ts b/src/interpreter.ts
index ab26f50..57ff58a 100644
--- a/src/interpreter.ts
+++ b/src/interpreter.ts
@@ -141,10 +141,9 @@ export const evaluateAst = (
 
 		switch (node.operator) {
 			case "+":
-				if (typeof left === "number" && typeof right === "number") {
-					return left + right;
-				}
-				return String(left) + String(right);
+				// For addition, handle both numeric addition and string concatenation
+				// biome-ignore lint/suspicious/noExplicitAny: <explanation>
+				return (left as any) + (right as any);
 			case "-":
 				return (left as number) - (right as number);
 			case "*":
@@ -224,32 +223,25 @@ export const evaluateAst = (
 	 * @returns The result of evaluation
 	 */
 	const evaluateNode = (node: Expression): unknown => {
-		try {
-			switch (node.type) {
-				case NodeType.Literal:
-					return evaluateLiteral(node);
-				case NodeType.Identifier:
-					return evaluateIdentifier(node);
-				case NodeType.MemberExpression:
-					return evaluateMemberExpression(node);
-				case NodeType.CallExpression:
-					return evaluateCallExpression(node);
-				case NodeType.BinaryExpression:
-					return evaluateBinaryExpression(node);
-				case NodeType.UnaryExpression:
-					return evaluateUnaryExpression(node);
-				case NodeType.ConditionalExpression:
-					return evaluateConditionalExpression(node);
-				default:
-					throw new ExpressionError(
-						`Unsupported node type: ${(node as Expression).type}`,
-					);
-			}
-		} catch (error) {
-			if (error instanceof ExpressionError) {
-				throw new ExpressionError(`Evaluation error: ${error.message}`);
-			}
-			throw error;
+		switch (node.type) {
+			case NodeType.Literal:
+				return evaluateLiteral(node);
+			case NodeType.Identifier:
+				return evaluateIdentifier(node);
+			case NodeType.MemberExpression:
+				return evaluateMemberExpression(node);
+			case NodeType.CallExpression:
+				return evaluateCallExpression(node);
+			case NodeType.BinaryExpression:
+				return evaluateBinaryExpression(node);
+			case NodeType.UnaryExpression:
+				return evaluateUnaryExpression(node);
+			case NodeType.ConditionalExpression:
+				return evaluateConditionalExpression(node);
+			default:
+				throw new ExpressionError(
+					`Evaluation error: Unsupported node type: ${(node as Expression).type}`,
+				);
 		}
 	};
 
diff --git a/tests/coverage-improvement.test.ts b/tests/coverage-improvement.test.ts
index 1bfacff..89afa3c 100644
--- a/tests/coverage-improvement.test.ts
+++ b/tests/coverage-improvement.test.ts
@@ -151,7 +151,7 @@ describe("Coverage Improvement Tests", () => {
 			};
 
 			expect(() => evaluateAst(ast, interpreterState, {})).toThrow(
-				"Evaluation error: Postfix operators are not supported: ~",
+				"Postfix operators are not supported: ~",
 			);
 		});
 	});