diff --git a/README.md b/README.md
index 01608d4..2b0d1e7 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ xml2js x 32.90 ops/sec ±8.11% (59 runs sampled)
 fast-xml-parser x 154 ops/sec ±4.06% (64 runs sampled)
 nkit4nodejs x 80.14 ops/sec ±2.99% (68 runs sampled)
 xml-js x 28.51 ops/sec ±8.18% (53 runs sampled)
+libxmljs x 107 ops/sec ±18.57% (48 runs sampled)
 ```
 
 * Please note that this is an unfair game for camaro because it only transform what it needs.
@@ -88,6 +89,12 @@ By default, a path `'//HotelSummary'` will transform all `HotelSummary` elements
 
     '//HotelSummary[namespace-uri() = "http://v3.hotel.wsapi.ean.com"]'
 
+## Using camaro on AWS Lambda
+
+In order to use `camaro` on AWS Lambda, you should download a copy of prebuilt camaro from [Releases](https://github.com/tuananh/camaro/releases) and put to this folder path `node_modules/camaro/lib/binding/camaro.node`.
+
+As of currently, AWS Lambda only supports node 6 on Linux so you're looking for `camaro-v2.1.0-node-v48-linux-x64.tar.gz`.
+
 ## Licence
 
 The MIT License
diff --git a/benchmark/index.js b/benchmark/index.js
index a2c2f6e..31ff30c 100644
--- a/benchmark/index.js
+++ b/benchmark/index.js
@@ -7,6 +7,7 @@ const xml2js = require('xml2js').parseString
 const fastXmlParser = require('fast-xml-parser')
 const nkit = require('nkit4nodejs')
 const xmljs = require('xml-js')
+const libxmljs = require("libxmljs")
 
 const suite = new benchmark.Suite()
 const xml = fs.readFileSync('examples/ean.xml', 'utf-8')
@@ -74,6 +75,10 @@ suite.add('xml-js', function() {
     const result = xmljs.xml2json(xml, {compact: true, spaces: 2})
 })
 
+suite.add('libxmljs', function() {
+    const xmlDoc = libxmljs.parseXml(xml)
+})
+
 suite.on('cycle', cycle)
 suite.run()
 
diff --git a/package-lock.json b/package-lock.json
index c6ace07..accfc7e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "camaro",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 471d056..8aaee05 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "camaro",
-  "version": "2.1.0",
+  "version": "2.1.2",
   "description": "Transforming XML to JSON using Node.js binding to native pugixml parser library",
   "homepage": "https://github.com/tuananh/camaro",
   "bugs": "https://github.com/tuananh/camaro/issues",
diff --git a/src/transform.cpp b/src/transform.cpp
index dafba59..103b25e 100644
--- a/src/transform.cpp
+++ b/src/transform.cpp
@@ -39,53 +39,44 @@ inline char charAt(string& str, size_t pos) {
 
 ReturnType get_return_type(string& path) {
   const char ch = charAt(path, 0);
+  ReturnType t = T_STRING;
   switch (ch) {
     case 'b':
       if (string_contains(path, "boolean(")) {
-        return T_BOOLEAN;
-      } else {
-        return T_STRING;
+        t = T_BOOLEAN;
       }
       break;
     case 'c':
       if (string_contains(path, "count(") || string_contains(path, "ceiling(")) {
-        return T_NUMBER;
-      } else {
-        return T_STRING;
+        t = T_NUMBER;
       }
       break;
     case 'f':
       if (string_contains(path, "floor(")) {
-        return T_NUMBER;
-      } else {
-        return T_STRING;
+        t = T_NUMBER;
       }
       break;
     case 'n':
       if (string_contains(path, "number(")) {
-        return T_NUMBER;
-      } else {
-        return T_STRING;
+        t = T_NUMBER;
       }
       break;
     case 'r':
       if (string_contains(path, "round(")) {
-        return T_NUMBER;
-      } else {
-        return T_STRING;
+        t = T_NUMBER;
       }
       break;
     case 's':
       if (string_contains(path, "sum(")) {
-        return T_NUMBER;
-      } else {
-        return T_STRING;
+        t = T_NUMBER;
       }
       break;
     default:
-      return T_STRING;
+      t = T_STRING;
       break;
   }
+
+  return t;
 }
 
 template <typename T>