diff --git a/packages/babel-core/src/tools/build-external-helpers.js b/packages/babel-core/src/tools/build-external-helpers.js
index fd1e91940b..057e4b69e9 100644
--- a/packages/babel-core/src/tools/build-external-helpers.js
+++ b/packages/babel-core/src/tools/build-external-helpers.js
@@ -73,26 +73,8 @@ function buildVar(namespace, builder) {
 }
 
 function buildHelpers(body, namespace, whitelist) {
-  function shouldIgnore(name) {
-    if (!whitelist) {
-      return false;
-    }
-
-    // check for the raw name
-    if (whitelist.indexOf(name) >= 0) {
-      return false;
-    }
-
-    // typeof -> _typeof
-    if (name[0] === "_" && whitelist.indexOf(name.slice(1)) >= 0) {
-      return false;
-    }
-
-    return true;
-  }
-
   each(helpers.list, function (name) {
-    if (shouldIgnore(name)) return;
+    if (whitelist && whitelist.indexOf(name) >= 0) return;
 
     let key = t.identifier(t.toIdentifier(name));
     body.push(t.expressionStatement(
diff --git a/packages/babel-core/src/transformation/file/index.js b/packages/babel-core/src/transformation/file/index.js
index 8871182bf6..80c4365e32 100644
--- a/packages/babel-core/src/transformation/file/index.js
+++ b/packages/babel-core/src/transformation/file/index.js
@@ -274,8 +274,7 @@ export default class File extends Store {
       let res = generator(name);
       if (res) return res;
     } else if (runtime) {
-      let id = t.identifier(t.toIdentifier(name));
-      return t.memberExpression(runtime, id);
+      return t.memberExpression(runtime, t.identifier(name));
     }
 
     let ref = getHelper(name);
diff --git a/packages/babel-generator/src/generators/expressions.js b/packages/babel-generator/src/generators/expressions.js
index 33280ecce8..cb27e684f2 100644
--- a/packages/babel-generator/src/generators/expressions.js
+++ b/packages/babel-generator/src/generators/expressions.js
@@ -6,6 +6,7 @@ import * as t from "babel-types";
 import n from "../node";
 
 const SCIENTIFIC_NOTATION = /e/i;
+const ZERO_DECIMAL_INTEGER = /\.0+$/;
 
 export function UnaryExpression(node: Object) {
   let needsSpace = /[a-z]$/.test(node.operator);
@@ -208,7 +209,7 @@ export function MemberExpression(node: Object) {
   } else {
     if (t.isLiteral(node.object) && !t.isTemplateLiteral(node.object)) {
       let val = this.getPossibleRaw(node.object) || this._stringLiteral(node.object);
-      if (isInteger(+val) && !SCIENTIFIC_NOTATION.test(val) && !this.endsWith(".")) {
+      if (isInteger(+val) && !SCIENTIFIC_NOTATION.test(val) && !ZERO_DECIMAL_INTEGER.test(val) && !this.endsWith(".")) {
         this.push(".");
       }
     }
diff --git a/packages/babel-generator/test/fixtures/types/MemberExpression/actual.js b/packages/babel-generator/test/fixtures/types/MemberExpression/actual.js
index b1b488aa12..9b64980fc1 100644
--- a/packages/babel-generator/test/fixtures/types/MemberExpression/actual.js
+++ b/packages/babel-generator/test/fixtures/types/MemberExpression/actual.js
@@ -9,3 +9,5 @@ foo[test()][bar()];
 
 0..toString();
 0.5.toString();
+1.0.toString();
+1.000.toString();
diff --git a/packages/babel-generator/test/fixtures/types/MemberExpression/expected.js b/packages/babel-generator/test/fixtures/types/MemberExpression/expected.js
index b1b488aa12..9b64980fc1 100644
--- a/packages/babel-generator/test/fixtures/types/MemberExpression/expected.js
+++ b/packages/babel-generator/test/fixtures/types/MemberExpression/expected.js
@@ -9,3 +9,5 @@ foo[test()][bar()];
 
 0..toString();
 0.5.toString();
+1.0.toString();
+1.000.toString();
diff --git a/packages/babel-helpers/src/index.js b/packages/babel-helpers/src/index.js
index 7a83143ccc..46fb1080e0 100644
--- a/packages/babel-helpers/src/index.js
+++ b/packages/babel-helpers/src/index.js
@@ -7,6 +7,8 @@ export function get(name) {
   return fn().expression;
 }
 
-export let list = Object.keys(helpers).filter(name => name !== "__esModule");
+export let list = Object.keys(helpers)
+  .map(name => name[0] === "_" ? name.slice(1) : name)
+  .filter(name => name !== "__esModule");
 
 export default get;
diff --git a/packages/babel-preset-react/index.js b/packages/babel-preset-react/index.js
index 54489509f4..89f691a454 100644
--- a/packages/babel-preset-react/index.js
+++ b/packages/babel-preset-react/index.js
@@ -6,11 +6,11 @@ module.exports = {
     require("babel-plugin-syntax-jsx"),
     require("babel-plugin-transform-react-display-name"),
   ],
-  env: {
+  /*env: {
     development: {
       plugins: [
         require("babel-plugin-transform-react-jsx-source")
       ]
     }
-  }
+  }*/
 };
diff --git a/packages/babel-register/package.json b/packages/babel-register/package.json
index ce15d07fce..007ddd760b 100644
--- a/packages/babel-register/package.json
+++ b/packages/babel-register/package.json
@@ -13,9 +13,7 @@
     "path-exists": "^1.0.0",
     "lodash": "^3.10.0",
     "source-map-support": "^0.2.10",
-    "babel-core": "^6.1.4"
-  },
-  "devDependencies": {
+    "babel-core": "^6.1.4",
     "babel-runtime": "^5.0.0"
   }
 }