improve ease of use for --mangle except

README.md

@@ -142,7 +142,6 @@ The available options are:
 ```
 TODOs:
 ```
-  -r, --reserved                Reserved names to exclude from mangling.
   --lint                        Display some scope warnings
   --reserved-file               File containing reserved names
   --reserve-domprops            Make (most?) DOM properties reserved for
@@ -206,10 +205,10 @@ To enable the mangler you need to pass `--mangle` (`-m`).  The following
   (disabled by default).
 
 When mangling is enabled but you want to prevent certain names from being
-mangled, you can declare those names with `--reserved` (`-r`) — pass a
+mangled, you can declare those names with `--mangle except` — pass a
 comma-separated list of names.  For example:
 
-    uglifyjs ... -m -r '$,require,exports'
+    uglifyjs ... -m except=[$,require,exports]
 
 to prevent the `require`, `exports` and `$` names from being changed.
 

bin/uglifyjs

@@ -246,10 +246,10 @@ function parseJS(flag, constants) {
                     var value = node.right;
                     if (!constants) {
                         options[name] = value;
-                    } else if (value instanceof UglifyJS.AST_Constant) {
-                        options[name] = value.getValue();
+                    } else if (value instanceof UglifyJS.AST_Array) {
+                        options[name] = value.elements.map(to_string);
                     } else {
-                        options[name] = value.print_to_string();
+                        options[name] = to_string(value);
                     }
                     return true;
                 }
@@ -259,6 +259,10 @@ function parseJS(flag, constants) {
                     return true;
                 }
                 if (!(node instanceof UglifyJS.AST_Sequence)) throw node;
+
+                function to_string(value) {
+                    return value instanceof UglifyJS.AST_Constant ? value.getValue() : value.print_to_string();
+                }
             }));
         } catch(ex) {
             fatal("Error parsing arguments for '" + flag + "': " + value);