diff --git a/common/content/io.js b/common/content/io.js
index 0502cb24..00342081 100644
--- a/common/content/io.js
+++ b/common/content/io.js
@@ -342,7 +342,7 @@ lookup:
         this.withSavedValues(["sourcing"], function () {
             this.sourcing = null;
             try {
-                var file = io.File(util.getFile(filename) || filename);
+                var file = util.getFile(filename) || io.File(filename);
 
                 if (!file.exists() || !file.isReadable() || file.isDirectory()) {
                     if (!silent)
diff --git a/common/content/options.js b/common/content/options.js
index 54a97f11..99e6d51f 100644
--- a/common/content/options.js
+++ b/common/content/options.js
@@ -223,11 +223,11 @@ const Option = Class("Option", {
      */
     op: function (operator, values, scope, invert, str) {
 
-        let newValues = this._op(operator, values, scope, invert);
-        if (newValues == null)
-            return "Operator " + operator + " not supported for option type " + this.type;
-
         try {
+            var newValues = this._op(operator, values, scope, invert);
+            if (newValues == null)
+                return "Operator " + operator + " not supported for option type " + this.type;
+
             if (!this.isValidValue(newValues))
                 return this.invalidArgument(str || this.stringify(values), operator);
         }
@@ -489,9 +489,11 @@ const Option = Class("Option", {
         },
 
         number: function (operator, values, scope, invert) {
-            // TODO: support floats? Validators need updating.
-            if (!/^[+-]?(?:0x[0-9a-f]+|0[0-7]*|[1-9][0-9]*)$/i.test(values))
-                return "E521: Number required after := " + this.name + "=" + values;
+            if (invert)
+                values = values[(values.indexOf(String(this.value)) + 1) % values.length]
+
+            dactyl.assert(!isNaN(values) && Number(values) == parseInt(values),
+                          "E521: Number required after := " + this.name + "=" + values);
 
             let value = parseInt(values);
 
@@ -561,6 +563,8 @@ const Option = Class("Option", {
         get regexpmap() this.stringlist,
 
         string: function (operator, values, scope, invert) {
+            if (invert)
+                return values[(values.indexOf(this.value) + 1) % values.length]
             switch (operator) {
             case "+":
                 return this.value + values;
@@ -907,10 +911,12 @@ const Options = Module("options", {
                 }
                 // write access
                 else {
-                    if (opt.option.type == "boolean") {
+                    if (opt.option.type === "boolean") {
                         dactyl.assert(!opt.valueGiven, "E474: Invalid argument: " + arg);
                         opt.values = !opt.unsetBoolean;
                     }
+                    else if (/^(string|number)$/.test(opt.option.type) && opt.invert)
+                        opt.values = Option.splitList(opt.value);
                     try {
                         var res = opt.option.op(opt.operator || "=", opt.values, opt.scope, opt.invert,
                                                 opt.value);
diff --git a/common/locale/en-US/options.xml b/common/locale/en-US/options.xml
index bb2e8153..d9d24776 100644
--- a/common/locale/en-US/options.xml
+++ b/common/locale/en-US/options.xml
@@ -404,19 +404,17 @@
         </note>
 
         <example>
-            <p>
-                To enable auto-completion for everything but <ex>:history</ex> or
-                <ex>:bmarks</ex>, you would choose a value such as
-                <str delim="">!/ex/(bmarks|history),.?</str>
-            </p>
-
-            <p>
-                To go in the other direction, i.e. <em>only</em> enable
-                auto-completion for those commands, you have to jump through
-                some hoops, due to the way contexts work (see the note above):
-                <str delim="">/ex/(bmarks|history),^(/|/ex/?)$</str>
-            </p>
+            To enable auto-completion for everything but <ex>:history</ex> or
+            <ex>:bmarks</ex>, you would choose a value such as
+            <str delim="">!/ex/(bmarks|history),.?</str>
         </example>
+
+        <p>
+            To go in the other direction, i.e. <em>only</em> enable
+            auto-completion for those commands, you have to jump through
+            some hoops, due to the way contexts work (see the note above):
+            <str delim="">/ex/(bmarks|history),^(/|/ex/?)$</str>
+        </p>
     </description>
 </item>
 
diff --git a/common/modules/styles.jsm b/common/modules/styles.jsm
index 67c5cffb..5a445eb2 100644
--- a/common/modules/styles.jsm
+++ b/common/modules/styles.jsm
@@ -426,7 +426,7 @@ const Styles = Module("Styles", {
                 for (let item in Iterator({ Active: true, Inactive: false })) {
                     let [name, active] = item;
                     context.fork(name, 0, null, function (context) {
-                        context.title[0] = name + " " + context.title[0];
+                        context.title[0] = name + " Sheets";
                         context.generate = generate || function () styles.userSheets;
                         context.filters.push(function (item) item.active == active);
                     });