Merge branch 'master' into harmony-v2.8.22

lib/propmangle.js

@@ -53,7 +53,15 @@ function find_builtins() {
         objects[new_global] = global[new_global] || new Function();
     });
 
-    var a = [];
+    // NaN will be included due to Number.NaN
+    var a = [
+        "null",
+        "true",
+        "false",
+        "Infinity",
+        "-Infinity",
+        "undefined",
+    ];
     [ Object, Array, Function, Number,
       String, Boolean, Error, Math,
       Date, RegExp, objects.Symbol, ArrayBuffer,
@@ -174,13 +182,12 @@ function mangle_properties(ast, options) {
     // only function declarations after this line
 
     function can_mangle(name) {
-        if (!is_identifier(name)) return false;
         if (unmangleable.indexOf(name) >= 0) return false;
         if (reserved.indexOf(name) >= 0) return false;
         if (options.only_cache) {
             return cache.props.has(name);
         }
-        if (/^[0-9.]+$/.test(name)) return false;
+        if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
         return true;
     }