make sure all calls to command actions use sensible defaults

content/commands.js

@@ -86,6 +86,11 @@ liberator.Command.prototype = {
 
     execute: function (args, special, count, modifiers)
     {
+        // XXX
+        special = !!special;
+        count = (count === undefined) ? -1 : count;
+        modifiers = modifiers || {};
+
         // whenever the user specifies special options or fixed number of arguments
         // we use our args parser instead of passing a string to the callback
         if (this.options.length > 0 || this.argCount)

content/options.js

@@ -482,10 +482,7 @@ liberator.Options = function () //{{{
             if (name == "all")
                 all = true;
 
-            var scope = liberator.options.OPTION_SCOPE_BOTH;
-            if (modifiers && modifiers.scope)
-                scope = modifiers.scope;
-
+            var scope = modifiers.scope || liberator.options.OPTION_SCOPE_BOTH;
             var option = liberator.options.get(name, scope);
 
             if (!option && !all)