diff --git a/src/array.js b/src/array.js
index cfaa324d18..4520a34e35 100644
--- a/src/array.js
+++ b/src/array.js
@@ -19,16 +19,17 @@ var $arrayUnshift;
 // -------------------------------------------------------------------
 // Imports
 
+var Delete;
 var GlobalArray = global.Array;
 var InternalArray = utils.InternalArray;
 var InternalPackedArray = utils.InternalPackedArray;
-
-var Delete;
 var MathMin;
 var ObjectHasOwnProperty;
 var ObjectIsFrozen;
 var ObjectIsSealed;
 var ObjectToString;
+var ToNumber;
+var ToString;
 
 utils.Import(function(from) {
   Delete = from.Delete;
@@ -37,6 +38,8 @@ utils.Import(function(from) {
   ObjectIsFrozen = from.ObjectIsFrozen;
   ObjectIsSealed = from.ObjectIsSealed;
   ObjectToString = from.ObjectToString;
+  ToNumber = from.ToNumber;
+  ToString = from.ToString;
 });
 
 // -------------------------------------------------------------------
@@ -216,7 +219,7 @@ function ConvertToString(x) {
   // Assumes x is a non-string.
   if (IS_NUMBER(x)) return %_NumberToString(x);
   if (IS_BOOLEAN(x)) return x ? 'true' : 'false';
-  return (IS_NULL_OR_UNDEFINED(x)) ? '' : $toString($defaultString(x));
+  return (IS_NULL_OR_UNDEFINED(x)) ? '' : ToString($defaultString(x));
 }
 
 
@@ -228,7 +231,7 @@ function ConvertToLocaleString(e) {
     // must throw a TypeError if ToObject(e).toLocaleString isn't
     // callable.
     var e_obj = TO_OBJECT(e);
-    return $toString(e_obj.toLocaleString());
+    return ToString(e_obj.toLocaleString());
   }
 }
 
@@ -914,8 +917,8 @@ function InnerArraySort(length, comparefn) {
       if (%_IsSmi(x) && %_IsSmi(y)) {
         return %SmiLexicographicCompare(x, y);
       }
-      x = $toString(x);
-      y = $toString(y);
+      x = ToString(x);
+      y = ToString(y);
       if (x == y) return 0;
       else return x < y ? -1 : 1;
     };
diff --git a/src/arraybuffer.js b/src/arraybuffer.js
index 9657b9e376..2edcd12cad 100644
--- a/src/arraybuffer.js
+++ b/src/arraybuffer.js
@@ -13,13 +13,14 @@
 
 var GlobalArrayBuffer = global.ArrayBuffer;
 var GlobalObject = global.Object;
-
 var MathMax;
 var MathMin;
+var ToNumber;
 
 utils.Import(function(from) {
   MathMax = from.MathMax;
   MathMin = from.MathMin;
+  ToNumber = from.ToNumber;
 });
 
 // -------------------------------------------------------------------
diff --git a/src/date.js b/src/date.js
index 0a19a13e08..3a74e102ee 100644
--- a/src/date.js
+++ b/src/date.js
@@ -17,15 +17,18 @@ var $createDate;
 
 var GlobalDate = global.Date;
 var InternalArray = utils.InternalArray;
-
 var IsFinite;
 var MathAbs;
 var MathFloor;
+var ToNumber;
+var ToString;
 
 utils.Import(function(from) {
   IsFinite = from.IsFinite;
   MathAbs = from.MathAbs;
   MathFloor = from.MathFloor;
+  ToNumber = from.ToNumber;
+  ToString = from.ToString;
 });
 
 // -------------------------------------------------------------------
@@ -169,17 +172,17 @@ function DateConstructor(year, month, date, hours, minutes, seconds, ms) {
       // which is the default for everything else than Date objects.
       // This makes us behave like KJS and SpiderMonkey.
       var time = $toPrimitive(year, NUMBER_HINT);
-      value = IS_STRING(time) ? DateParse(time) : $toNumber(time);
+      value = IS_STRING(time) ? DateParse(time) : ToNumber(time);
     }
     SET_UTC_DATE_VALUE(this, value);
   } else {
-    year = $toNumber(year);
-    month = $toNumber(month);
-    date = argc > 2 ? $toNumber(date) : 1;
-    hours = argc > 3 ? $toNumber(hours) : 0;
-    minutes = argc > 4 ? $toNumber(minutes) : 0;
-    seconds = argc > 5 ? $toNumber(seconds) : 0;
-    ms = argc > 6 ? $toNumber(ms) : 0;
+    year = ToNumber(year);
+    month = ToNumber(month);
+    date = argc > 2 ? ToNumber(date) : 1;
+    hours = argc > 3 ? ToNumber(hours) : 0;
+    minutes = argc > 4 ? ToNumber(minutes) : 0;
+    seconds = argc > 5 ? ToNumber(seconds) : 0;
+    ms = argc > 6 ? ToNumber(ms) : 0;
     year = (!NUMBER_IS_NAN(year) &&
             0 <= TO_INTEGER(year) &&
             TO_INTEGER(year) <= 99) ? 1900 + TO_INTEGER(year) : year;
@@ -267,7 +270,7 @@ var parse_buffer = new InternalArray(8);
 
 // ECMA 262 - 15.9.4.2
 function DateParse(string) {
-  var arr = %DateParseString($toString(string), parse_buffer);
+  var arr = %DateParseString(ToString(string), parse_buffer);
   if (IS_NULL(arr)) return NAN;
 
   var day = MakeDay(arr[0], arr[1], arr[2]);
@@ -284,14 +287,14 @@ function DateParse(string) {
 
 // ECMA 262 - 15.9.4.3
 function DateUTC(year, month, date, hours, minutes, seconds, ms) {
-  year = $toNumber(year);
-  month = $toNumber(month);
+  year = ToNumber(year);
+  month = ToNumber(month);
   var argc = %_ArgumentsLength();
-  date = argc > 2 ? $toNumber(date) : 1;
-  hours = argc > 3 ? $toNumber(hours) : 0;
-  minutes = argc > 4 ? $toNumber(minutes) : 0;
-  seconds = argc > 5 ? $toNumber(seconds) : 0;
-  ms = argc > 6 ? $toNumber(ms) : 0;
+  date = argc > 2 ? ToNumber(date) : 1;
+  hours = argc > 3 ? ToNumber(hours) : 0;
+  minutes = argc > 4 ? ToNumber(minutes) : 0;
+  seconds = argc > 5 ? ToNumber(seconds) : 0;
+  ms = argc > 6 ? ToNumber(ms) : 0;
   year = (!NUMBER_IS_NAN(year) &&
           0 <= TO_INTEGER(year) &&
           TO_INTEGER(year) <= 99) ? 1900 + TO_INTEGER(year) : year;
@@ -497,7 +500,7 @@ function DateGetTimezoneOffset() {
 // ECMA 262 - 15.9.5.27
 function DateSetTime(ms) {
   CHECK_DATE(this);
-  SET_UTC_DATE_VALUE(this, $toNumber(ms));
+  SET_UTC_DATE_VALUE(this, ToNumber(ms));
   return UTC_DATE_VALUE(this);
 }
 
@@ -506,7 +509,7 @@ function DateSetTime(ms) {
 function DateSetMilliseconds(ms) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  ms = $toNumber(ms);
+  ms = ToNumber(ms);
   var time = MakeTime(LOCAL_HOUR(this), LOCAL_MIN(this), LOCAL_SEC(this), ms);
   return SET_LOCAL_DATE_VALUE(this, MakeDate(LOCAL_DAYS(this), time));
 }
@@ -516,7 +519,7 @@ function DateSetMilliseconds(ms) {
 function DateSetUTCMilliseconds(ms) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  ms = $toNumber(ms);
+  ms = ToNumber(ms);
   var time = MakeTime(UTC_HOUR(this),
                       UTC_MIN(this),
                       UTC_SEC(this),
@@ -529,8 +532,8 @@ function DateSetUTCMilliseconds(ms) {
 function DateSetSeconds(sec, ms) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  sec = $toNumber(sec);
-  ms = %_ArgumentsLength() < 2 ? LOCAL_MS(this) : $toNumber(ms);
+  sec = ToNumber(sec);
+  ms = %_ArgumentsLength() < 2 ? LOCAL_MS(this) : ToNumber(ms);
   var time = MakeTime(LOCAL_HOUR(this), LOCAL_MIN(this), sec, ms);
   return SET_LOCAL_DATE_VALUE(this, MakeDate(LOCAL_DAYS(this), time));
 }
@@ -540,8 +543,8 @@ function DateSetSeconds(sec, ms) {
 function DateSetUTCSeconds(sec, ms) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  sec = $toNumber(sec);
-  ms = %_ArgumentsLength() < 2 ? UTC_MS(this) : $toNumber(ms);
+  sec = ToNumber(sec);
+  ms = %_ArgumentsLength() < 2 ? UTC_MS(this) : ToNumber(ms);
   var time = MakeTime(UTC_HOUR(this), UTC_MIN(this), sec, ms);
   return SET_UTC_DATE_VALUE(this, MakeDate(UTC_DAYS(this), time));
 }
@@ -551,10 +554,10 @@ function DateSetUTCSeconds(sec, ms) {
 function DateSetMinutes(min, sec, ms) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  min = $toNumber(min);
+  min = ToNumber(min);
   var argc = %_ArgumentsLength();
-  sec = argc < 2 ? LOCAL_SEC(this) : $toNumber(sec);
-  ms = argc < 3 ? LOCAL_MS(this) : $toNumber(ms);
+  sec = argc < 2 ? LOCAL_SEC(this) : ToNumber(sec);
+  ms = argc < 3 ? LOCAL_MS(this) : ToNumber(ms);
   var time = MakeTime(LOCAL_HOUR(this), min, sec, ms);
   return SET_LOCAL_DATE_VALUE(this, MakeDate(LOCAL_DAYS(this), time));
 }
@@ -564,10 +567,10 @@ function DateSetMinutes(min, sec, ms) {
 function DateSetUTCMinutes(min, sec, ms) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  min = $toNumber(min);
+  min = ToNumber(min);
   var argc = %_ArgumentsLength();
-  sec = argc < 2 ? UTC_SEC(this) : $toNumber(sec);
-  ms = argc < 3 ? UTC_MS(this) : $toNumber(ms);
+  sec = argc < 2 ? UTC_SEC(this) : ToNumber(sec);
+  ms = argc < 3 ? UTC_MS(this) : ToNumber(ms);
   var time = MakeTime(UTC_HOUR(this), min, sec, ms);
   return SET_UTC_DATE_VALUE(this, MakeDate(UTC_DAYS(this), time));
 }
@@ -577,11 +580,11 @@ function DateSetUTCMinutes(min, sec, ms) {
 function DateSetHours(hour, min, sec, ms) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  hour = $toNumber(hour);
+  hour = ToNumber(hour);
   var argc = %_ArgumentsLength();
-  min = argc < 2 ? LOCAL_MIN(this) : $toNumber(min);
-  sec = argc < 3 ? LOCAL_SEC(this) : $toNumber(sec);
-  ms = argc < 4 ? LOCAL_MS(this) : $toNumber(ms);
+  min = argc < 2 ? LOCAL_MIN(this) : ToNumber(min);
+  sec = argc < 3 ? LOCAL_SEC(this) : ToNumber(sec);
+  ms = argc < 4 ? LOCAL_MS(this) : ToNumber(ms);
   var time = MakeTime(hour, min, sec, ms);
   return SET_LOCAL_DATE_VALUE(this, MakeDate(LOCAL_DAYS(this), time));
 }
@@ -591,11 +594,11 @@ function DateSetHours(hour, min, sec, ms) {
 function DateSetUTCHours(hour, min, sec, ms) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  hour = $toNumber(hour);
+  hour = ToNumber(hour);
   var argc = %_ArgumentsLength();
-  min = argc < 2 ? UTC_MIN(this) : $toNumber(min);
-  sec = argc < 3 ? UTC_SEC(this) : $toNumber(sec);
-  ms = argc < 4 ? UTC_MS(this) : $toNumber(ms);
+  min = argc < 2 ? UTC_MIN(this) : ToNumber(min);
+  sec = argc < 3 ? UTC_SEC(this) : ToNumber(sec);
+  ms = argc < 4 ? UTC_MS(this) : ToNumber(ms);
   var time = MakeTime(hour, min, sec, ms);
   return SET_UTC_DATE_VALUE(this, MakeDate(UTC_DAYS(this), time));
 }
@@ -605,7 +608,7 @@ function DateSetUTCHours(hour, min, sec, ms) {
 function DateSetDate(date) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  date = $toNumber(date);
+  date = ToNumber(date);
   var day = MakeDay(LOCAL_YEAR(this), LOCAL_MONTH(this), date);
   return SET_LOCAL_DATE_VALUE(this, MakeDate(day, LOCAL_TIME_IN_DAY(this)));
 }
@@ -615,7 +618,7 @@ function DateSetDate(date) {
 function DateSetUTCDate(date) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  date = $toNumber(date);
+  date = ToNumber(date);
   var day = MakeDay(UTC_YEAR(this), UTC_MONTH(this), date);
   return SET_UTC_DATE_VALUE(this, MakeDate(day, UTC_TIME_IN_DAY(this)));
 }
@@ -625,8 +628,8 @@ function DateSetUTCDate(date) {
 function DateSetMonth(month, date) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  month = $toNumber(month);
-  date = %_ArgumentsLength() < 2 ? LOCAL_DAY(this) : $toNumber(date);
+  month = ToNumber(month);
+  date = %_ArgumentsLength() < 2 ? LOCAL_DAY(this) : ToNumber(date);
   var day = MakeDay(LOCAL_YEAR(this), month, date);
   return SET_LOCAL_DATE_VALUE(this, MakeDate(day, LOCAL_TIME_IN_DAY(this)));
 }
@@ -636,8 +639,8 @@ function DateSetMonth(month, date) {
 function DateSetUTCMonth(month, date) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  month = $toNumber(month);
-  date = %_ArgumentsLength() < 2 ? UTC_DAY(this) : $toNumber(date);
+  month = ToNumber(month);
+  date = %_ArgumentsLength() < 2 ? UTC_DAY(this) : ToNumber(date);
   var day = MakeDay(UTC_YEAR(this), month, date);
   return SET_UTC_DATE_VALUE(this, MakeDate(day, UTC_TIME_IN_DAY(this)));
 }
@@ -647,16 +650,16 @@ function DateSetUTCMonth(month, date) {
 function DateSetFullYear(year, month, date) {
   CHECK_DATE(this);
   var t = LOCAL_DATE_VALUE(this);
-  year = $toNumber(year);
+  year = ToNumber(year);
   var argc = %_ArgumentsLength();
   var time ;
   if (NUMBER_IS_NAN(t)) {
-    month = argc < 2 ? 0 : $toNumber(month);
-    date = argc < 3 ? 1 : $toNumber(date);
+    month = argc < 2 ? 0 : ToNumber(month);
+    date = argc < 3 ? 1 : ToNumber(date);
     time = 0;
   } else {
-    month = argc < 2 ? LOCAL_MONTH(this) : $toNumber(month);
-    date = argc < 3 ? LOCAL_DAY(this) : $toNumber(date);
+    month = argc < 2 ? LOCAL_MONTH(this) : ToNumber(month);
+    date = argc < 3 ? LOCAL_DAY(this) : ToNumber(date);
     time = LOCAL_TIME_IN_DAY(this);
   }
   var day = MakeDay(year, month, date);
@@ -668,16 +671,16 @@ function DateSetFullYear(year, month, date) {
 function DateSetUTCFullYear(year, month, date) {
   CHECK_DATE(this);
   var t = UTC_DATE_VALUE(this);
-  year = $toNumber(year);
+  year = ToNumber(year);
   var argc = %_ArgumentsLength();
   var time ;
   if (NUMBER_IS_NAN(t)) {
-    month = argc < 2 ? 0 : $toNumber(month);
-    date = argc < 3 ? 1 : $toNumber(date);
+    month = argc < 2 ? 0 : ToNumber(month);
+    date = argc < 3 ? 1 : ToNumber(date);
     time = 0;
   } else {
-    month = argc < 2 ? UTC_MONTH(this) : $toNumber(month);
-    date = argc < 3 ? UTC_DAY(this) : $toNumber(date);
+    month = argc < 2 ? UTC_MONTH(this) : ToNumber(month);
+    date = argc < 3 ? UTC_DAY(this) : ToNumber(date);
     time = UTC_TIME_IN_DAY(this);
   }
   var day = MakeDay(year, month, date);
@@ -709,7 +712,7 @@ function DateGetYear() {
 // ECMA 262 - B.2.5
 function DateSetYear(year) {
   CHECK_DATE(this);
-  year = $toNumber(year);
+  year = ToNumber(year);
   if (NUMBER_IS_NAN(year)) return SET_UTC_DATE_VALUE(this, NAN);
   year = (0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
       ? 1900 + TO_INTEGER(year) : year;
diff --git a/src/debug/debug.js b/src/debug/debug.js
index 011e730805..2e51d43088 100644
--- a/src/debug/debug.js
+++ b/src/debug/debug.js
@@ -21,10 +21,16 @@ var MathMin = global.Math.min;
 var Mirror = global.Mirror;
 var MirrorType;
 var ParseInt = global.parseInt;
+var ToBoolean;
+var ToNumber;
+var ToString;
 var ValueMirror = global.ValueMirror;
 
 utils.Import(function(from) {
   MirrorType = from.MirrorType;
+  ToBoolean = from.ToBoolean;
+  ToNumber = from.ToNumber;
+  ToString = from.ToString;
 });
 
 //----------------------------------------------------------------------------
@@ -228,7 +234,7 @@ BreakPoint.prototype.isTriggered = function(exec_state) {
     try {
       var mirror = exec_state.frame(0).evaluate(this.condition());
       // If no sensible mirror or non true value break point not triggered.
-      if (!(mirror instanceof ValueMirror) || !$toBoolean(mirror.value_)) {
+      if (!(mirror instanceof ValueMirror) || !ToBoolean(mirror.value_)) {
         return false;
       }
     } catch (e) {
@@ -944,8 +950,8 @@ function ExecutionState(break_id) {
 ExecutionState.prototype.prepareStep = function(opt_action, opt_count,
     opt_callframe) {
   var action = Debug.StepAction.StepIn;
-  if (!IS_UNDEFINED(opt_action)) action = $toNumber(opt_action);
-  var count = opt_count ? $toNumber(opt_count) : 1;
+  if (!IS_UNDEFINED(opt_action)) action = ToNumber(opt_action);
+  var count = opt_count ? ToNumber(opt_count) : 1;
   var callFrameId = 0;
   if (!IS_UNDEFINED(opt_callframe)) {
     callFrameId = opt_callframe.details_.frameId();
@@ -957,7 +963,7 @@ ExecutionState.prototype.prepareStep = function(opt_action, opt_count,
 ExecutionState.prototype.evaluateGlobal = function(source, disable_break,
     opt_additional_context) {
   return MakeMirror(%DebugEvaluateGlobal(this.break_id, source,
-                                         $toBoolean(disable_break),
+                                         ToBoolean(disable_break),
                                          opt_additional_context));
 };
 
@@ -979,7 +985,7 @@ ExecutionState.prototype.frame = function(opt_index) {
 };
 
 ExecutionState.prototype.setSelectedFrame = function(index) {
-  var i = $toNumber(index);
+  var i = ToNumber(index);
   if (i < 0 || i >= this.frameCount()) {
     throw MakeTypeError(kDebuggerFrame);
   }
@@ -1426,7 +1432,7 @@ DebugCommandProcessor.prototype.processDebugJSONRequest = function(
         response = this.createResponse();
       }
       response.success = false;
-      response.message = $toString(e);
+      response.message = ToString(e);
     }
 
     // Return the response as a JSON encoded string.
@@ -1443,7 +1449,7 @@ DebugCommandProcessor.prototype.processDebugJSONRequest = function(
               '"request_seq":' + request.seq + ',' +
               '"type":"response",' +
               '"success":false,' +
-              '"message":"Internal error: ' + $toString(e) + '"}';
+              '"message":"Internal error: ' + ToString(e) + '"}';
     }
   } catch (e) {
     // Failed in one of the catch blocks above - most generic error.
@@ -1464,7 +1470,7 @@ DebugCommandProcessor.prototype.continueRequest_ = function(request, response) {
 
     // Get the stepcount argument if any.
     if (stepcount) {
-      count = $toNumber(stepcount);
+      count = ToNumber(stepcount);
       if (count < 0) {
         throw MakeError(kDebugger,
                         'Invalid stepcount argument "' + stepcount + '".');
@@ -1539,7 +1545,7 @@ DebugCommandProcessor.prototype.setBreakPointRequest_ =
       // Find the function through a global evaluate.
       f = this.exec_state_.evaluateGlobal(target).value();
     } catch (e) {
-      response.failed('Error: "' + $toString(e) +
+      response.failed('Error: "' + ToString(e) +
                       '" evaluating "' + target + '"');
       return;
     }
@@ -1628,7 +1634,7 @@ DebugCommandProcessor.prototype.changeBreakPointRequest_ = function(
   }
 
   // Pull out arguments.
-  var break_point = $toNumber(request.arguments.breakpoint);
+  var break_point = ToNumber(request.arguments.breakpoint);
   var enabled = request.arguments.enabled;
   var condition = request.arguments.condition;
   var ignoreCount = request.arguments.ignoreCount;
@@ -1704,7 +1710,7 @@ DebugCommandProcessor.prototype.clearBreakPointRequest_ = function(
   }
 
   // Pull out arguments.
-  var break_point = $toNumber(request.arguments.breakpoint);
+  var break_point = ToNumber(request.arguments.breakpoint);
 
   // Check for legal arguments.
   if (!break_point) {
@@ -1962,7 +1968,7 @@ DebugCommandProcessor.prototype.scopeRequest_ = function(request, response) {
   // With no scope argument just return top scope.
   var scope_index = 0;
   if (request.arguments && !IS_UNDEFINED(request.arguments.number)) {
-    scope_index = $toNumber(request.arguments.number);
+    scope_index = ToNumber(request.arguments.number);
     if (scope_index < 0 || scope_holder.scopeCount() <= scope_index) {
       return response.failed('Invalid scope number');
     }
@@ -1986,11 +1992,11 @@ DebugCommandProcessor.resolveValue_ = function(value_description) {
     return value_mirror.value();
   } else if ("stringDescription" in value_description) {
     if (value_description.type == MirrorType.BOOLEAN_TYPE) {
-      return $toBoolean(value_description.stringDescription);
+      return ToBoolean(value_description.stringDescription);
     } else if (value_description.type == MirrorType.NUMBER_TYPE) {
-      return $toNumber(value_description.stringDescription);
+      return ToNumber(value_description.stringDescription);
     } if (value_description.type == MirrorType.STRING_TYPE) {
-      return $toString(value_description.stringDescription);
+      return ToString(value_description.stringDescription);
     } else {
       throw MakeError(kDebugger, "Unknown type");
     }
@@ -2026,7 +2032,7 @@ DebugCommandProcessor.prototype.setVariableValueRequest_ =
   if (IS_UNDEFINED(scope_description.number)) {
     response.failed('Missing scope number');
   }
-  var scope_index = $toNumber(scope_description.number);
+  var scope_index = ToNumber(scope_description.number);
 
   var scope = scope_holder.scope(scope_index);
 
@@ -2058,7 +2064,7 @@ DebugCommandProcessor.prototype.evaluateRequest_ = function(request, response) {
   // The expression argument could be an integer so we convert it to a
   // string.
   try {
-    expression = $toString(expression);
+    expression = ToString(expression);
   } catch(e) {
     return response.failed('Failed to convert expression argument to string');
   }
@@ -2088,7 +2094,7 @@ DebugCommandProcessor.prototype.evaluateRequest_ = function(request, response) {
   if (global) {
     // Evaluate in the native context.
     response.body = this.exec_state_.evaluateGlobal(
-        expression, $toBoolean(disable_break), additional_context_object);
+        expression, ToBoolean(disable_break), additional_context_object);
     return;
   }
 
@@ -2104,18 +2110,18 @@ DebugCommandProcessor.prototype.evaluateRequest_ = function(request, response) {
 
   // Check whether a frame was specified.
   if (!IS_UNDEFINED(frame)) {
-    var frame_number = $toNumber(frame);
+    var frame_number = ToNumber(frame);
     if (frame_number < 0 || frame_number >= this.exec_state_.frameCount()) {
       return response.failed('Invalid frame "' + frame + '"');
     }
     // Evaluate in the specified frame.
     response.body = this.exec_state_.frame(frame_number).evaluate(
-        expression, $toBoolean(disable_break), additional_context_object);
+        expression, ToBoolean(disable_break), additional_context_object);
     return;
   } else {
     // Evaluate in the selected frame.
     response.body = this.exec_state_.frame().evaluate(
-        expression, $toBoolean(disable_break), additional_context_object);
+        expression, ToBoolean(disable_break), additional_context_object);
     return;
   }
 };
@@ -2136,7 +2142,7 @@ DebugCommandProcessor.prototype.lookupRequest_ = function(request, response) {
 
   // Set 'includeSource' option for script lookup.
   if (!IS_UNDEFINED(request.arguments.includeSource)) {
-    var includeSource = $toBoolean(request.arguments.includeSource);
+    var includeSource = ToBoolean(request.arguments.includeSource);
     response.setOption('includeSource', includeSource);
   }
 
@@ -2204,7 +2210,7 @@ DebugCommandProcessor.prototype.sourceRequest_ = function(request, response) {
     to_line = request.arguments.toLine;
 
     if (!IS_UNDEFINED(request.arguments.frame)) {
-      var frame_number = $toNumber(request.arguments.frame);
+      var frame_number = ToNumber(request.arguments.frame);
       if (frame_number < 0 || frame_number >= this.exec_state_.frameCount()) {
         return response.failed('Invalid frame "' + frame + '"');
       }
@@ -2240,7 +2246,7 @@ DebugCommandProcessor.prototype.scriptsRequest_ = function(request, response) {
   if (request.arguments) {
     // Pull out arguments.
     if (!IS_UNDEFINED(request.arguments.types)) {
-      types = $toNumber(request.arguments.types);
+      types = ToNumber(request.arguments.types);
       if (IsNaN(types) || types < 0) {
         return response.failed('Invalid types "' +
                                request.arguments.types + '"');
@@ -2248,7 +2254,7 @@ DebugCommandProcessor.prototype.scriptsRequest_ = function(request, response) {
     }
 
     if (!IS_UNDEFINED(request.arguments.includeSource)) {
-      includeSource = $toBoolean(request.arguments.includeSource);
+      includeSource = ToBoolean(request.arguments.includeSource);
       response.setOption('includeSource', includeSource);
     }
 
@@ -2263,7 +2269,7 @@ DebugCommandProcessor.prototype.scriptsRequest_ = function(request, response) {
     var filterStr = null;
     var filterNum = null;
     if (!IS_UNDEFINED(request.arguments.filter)) {
-      var num = $toNumber(request.arguments.filter);
+      var num = ToNumber(request.arguments.filter);
       if (!IsNaN(num)) {
         filterNum = num;
       }
@@ -2399,7 +2405,7 @@ DebugCommandProcessor.prototype.restartFrameRequest_ = function(
   var frame_mirror;
   // Check whether a frame was specified.
   if (!IS_UNDEFINED(frame)) {
-    var frame_number = $toNumber(frame);
+    var frame_number = ToNumber(frame);
     if (frame_number < 0 || frame_number >= this.exec_state_.frameCount()) {
       return response.failed('Invalid frame "' + frame + '"');
     }
diff --git a/src/debug/mirrors.js b/src/debug/mirrors.js
index 85ff2b2a90..f47a2d058e 100644
--- a/src/debug/mirrors.js
+++ b/src/debug/mirrors.js
@@ -8,10 +8,19 @@
 // ----------------------------------------------------------------------------
 // Imports
 
+var FunctionSourceString;
 var GlobalArray = global.Array;
 var IsNaN = global.isNaN;
 var JSONStringify = global.JSON.stringify;
 var MathMin = global.Math.min;
+var ToBoolean;
+var ToString;
+
+utils.Import(function(from) {
+  FunctionSourceString = from.FunctionSourceString;
+  ToBoolean = from.ToBoolean;
+  ToString = from.ToString;
+});
 
 // ----------------------------------------------------------------------------
 
@@ -990,7 +999,7 @@ FunctionMirror.prototype.source = function() {
   // Return source if function is resolved. Otherwise just fall through to
   // return undefined.
   if (this.resolved()) {
-    return builtins.$functionSourceString(this.value_);
+    return FunctionSourceString(this.value_);
   }
 };
 
@@ -1168,7 +1177,7 @@ ArrayMirror.prototype.indexedPropertiesFromRange = function(opt_from_index,
   if (from_index > to_index) return new GlobalArray();
   var values = new GlobalArray(to_index - from_index + 1);
   for (var i = from_index; i <= to_index; i++) {
-    var details = %DebugGetPropertyDetails(this.value_, builtins.$toString(i));
+    var details = %DebugGetPropertyDetails(this.value_, ToString(i));
     var value;
     if (details) {
       value = new PropertyMirror(this, i, details);
@@ -2068,7 +2077,7 @@ FrameMirror.prototype.evaluate = function(source, disable_break,
                                    this.details_.frameId(),
                                    this.details_.inlinedFrameIndex(),
                                    source,
-                                   $toBoolean(disable_break),
+                                   ToBoolean(disable_break),
                                    opt_context_object));
 };
 
diff --git a/src/harmony-array.js b/src/harmony-array.js
index 709a6e9e45..49176460ad 100644
--- a/src/harmony-array.js
+++ b/src/harmony-array.js
@@ -11,15 +11,15 @@
 // -------------------------------------------------------------------
 // Imports
 
-var GlobalArray = global.Array;
-var GlobalSymbol = global.Symbol;
-
 var GetIterator;
 var GetMethod;
+var GlobalArray = global.Array;
+var GlobalSymbol = global.Symbol;
 var MathMax;
 var MathMin;
 var ObjectIsFrozen;
 var ObjectDefineProperty;
+var ToNumber;
 
 utils.Import(function(from) {
   GetIterator = from.GetIterator;
@@ -28,6 +28,7 @@ utils.Import(function(from) {
   MathMin = from.MathMin;
   ObjectIsFrozen = from.ObjectIsFrozen;
   ObjectDefineProperty = from.ObjectDefineProperty;
+  ToNumber = from.ToNumber;
 });
 
 // -------------------------------------------------------------------
diff --git a/src/harmony-atomics.js b/src/harmony-atomics.js
index 96cc2145df..d4e069641a 100644
--- a/src/harmony-atomics.js
+++ b/src/harmony-atomics.js
@@ -12,11 +12,12 @@
 // Imports
 
 var GlobalObject = global.Object;
-
 var MathMax;
+var ToNumber;
 
 utils.Import(function(from) {
   MathMax = from.MathMax;
+  ToNumber = from.ToNumber;
 });
 
 // -------------------------------------------------------------------
@@ -49,8 +50,8 @@ function AtomicsCompareExchangeJS(sta, index, oldValue, newValue) {
   if (index < 0 || index >= %_TypedArrayGetLength(sta)) {
     return UNDEFINED;
   }
-  oldValue = $toNumber(oldValue);
-  newValue = $toNumber(newValue);
+  oldValue = ToNumber(oldValue);
+  newValue = ToNumber(newValue);
   return %_AtomicsCompareExchange(sta, index, oldValue, newValue);
 }
 
@@ -69,7 +70,7 @@ function AtomicsStoreJS(sta, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(sta)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsStore(sta, index, value);
 }
 
@@ -79,7 +80,7 @@ function AtomicsAddJS(ia, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsAdd(ia, index, value);
 }
 
@@ -89,7 +90,7 @@ function AtomicsSubJS(ia, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsSub(ia, index, value);
 }
 
@@ -99,7 +100,7 @@ function AtomicsAndJS(ia, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsAnd(ia, index, value);
 }
 
@@ -109,7 +110,7 @@ function AtomicsOrJS(ia, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsOr(ia, index, value);
 }
 
@@ -119,7 +120,7 @@ function AtomicsXorJS(ia, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsXor(ia, index, value);
 }
 
@@ -129,7 +130,7 @@ function AtomicsExchangeJS(ia, index, value) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  value = $toNumber(value);
+  value = ToNumber(value);
   return %_AtomicsExchange(ia, index, value);
 }
 
@@ -148,7 +149,7 @@ function AtomicsFutexWaitJS(ia, index, value, timeout) {
   if (IS_UNDEFINED(timeout)) {
     timeout = INFINITY;
   } else {
-    timeout = $toNumber(timeout);
+    timeout = ToNumber(timeout);
     if (NUMBER_IS_NAN(timeout)) {
       timeout = INFINITY;
     } else {
diff --git a/src/harmony-object.js b/src/harmony-object.js
index e0555ba112..12f25552e4 100644
--- a/src/harmony-object.js
+++ b/src/harmony-object.js
@@ -13,7 +13,6 @@
 // Imports
 
 var GlobalObject = global.Object;
-
 var OwnPropertyKeys;
 
 utils.Import(function(from) {
diff --git a/src/harmony-regexp.js b/src/harmony-regexp.js
index f4e1cb0f3f..150716744d 100644
--- a/src/harmony-regexp.js
+++ b/src/harmony-regexp.js
@@ -8,7 +8,15 @@
 
 %CheckIsBootstrapping();
 
+// -------------------------------------------------------------------
+// Imports
+
 var GlobalRegExp = global.RegExp;
+var ToString;
+
+utils.Import(function(from) {
+  ToString = from.ToString;
+});
 
 // -------------------------------------------------------------------
 
@@ -16,7 +24,7 @@ var GlobalRegExp = global.RegExp;
 // + https://bugs.ecmascript.org/show_bug.cgi?id=3423
 function RegExpGetFlags() {
   if (!IS_SPEC_OBJECT(this)) {
-    throw MakeTypeError(kFlagsGetterNonObject, $toString(this));
+    throw MakeTypeError(kFlagsGetterNonObject, ToString(this));
   }
   var result = '';
   if (this.global) result += 'g';
diff --git a/src/harmony-typedarray.js b/src/harmony-typedarray.js
index 8518b8571b..cd220dae83 100644
--- a/src/harmony-typedarray.js
+++ b/src/harmony-typedarray.js
@@ -51,6 +51,7 @@ var IsNaN;
 var MathMax;
 var MathMin;
 var PackedArrayReverse;
+var ToNumber;
 
 utils.Import(function(from) {
   ArrayFrom = from.ArrayFrom;
@@ -75,6 +76,7 @@ utils.Import(function(from) {
   MathMax = from.MathMax;
   MathMin = from.MathMin;
   PackedArrayReverse = from.PackedArrayReverse;
+  ToNumber = from.ToNumber;
 });
 
 // -------------------------------------------------------------------
diff --git a/src/i18n.js b/src/i18n.js
index 2b8ba90c27..cac267aa61 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -17,21 +17,18 @@
 // -------------------------------------------------------------------
 // Imports
 
+var ArrayIndexOf;
+var ArrayJoin;
+var IsFinite;
+var IsNaN;
 var GlobalBoolean = global.Boolean;
 var GlobalDate = global.Date;
 var GlobalNumber = global.Number;
 var GlobalRegExp = global.RegExp;
 var GlobalString = global.String;
-var ObjectDefineProperties = utils.ObjectDefineProperties;
-var ObjectDefineProperty = utils.ObjectDefineProperty;
-var SetFunctionName = utils.SetFunctionName;
-
-var ArrayIndexOf;
-var ArrayJoin;
-var IsFinite;
-var IsNaN;
 var MathFloor;
 var RegExpTest;
+var SetFunctionName = utils.SetFunctionName;
 var StringIndexOf;
 var StringLastIndexOf;
 var StringMatch;
@@ -54,6 +51,12 @@ utils.Import(function(from) {
   StringSplit = from.StringSplit;
   StringSubstr = from.StringSubstr;
   StringSubstring = from.StringSubstring;
+  ToNumber = from.ToNumber;
+});
+
+utils.ImportNow(function(from) {
+  ObjectDefineProperties = from.ObjectDefineProperties;
+  ObjectDefineProperty = from.ObjectDefineProperty;
 });
 
 // -------------------------------------------------------------------
@@ -1276,7 +1279,7 @@ SetFunctionName(Intl.NumberFormat.supportedLocalesOf, 'supportedLocalesOf');
  */
 function formatNumber(formatter, value) {
   // Spec treats -0 and +0 as 0.
-  var number = $toNumber(value) + 0;
+  var number = ToNumber(value) + 0;
 
   return %InternalNumberFormat(%GetImplFromInitializedIntlObject(formatter),
                                number);
@@ -1701,7 +1704,7 @@ function formatDate(formatter, dateValue) {
   if (IS_UNDEFINED(dateValue)) {
     dateMs = %DateCurrentTime();
   } else {
-    dateMs = $toNumber(dateValue);
+    dateMs = ToNumber(dateValue);
   }
 
   if (!IsFinite(dateMs)) throw MakeRangeError(kDateRange);
diff --git a/src/json.js b/src/json.js
index ec8bc96afa..36fda8e1e0 100644
--- a/src/json.js
+++ b/src/json.js
@@ -13,15 +13,18 @@
 
 var GlobalJSON = global.JSON;
 var InternalArray = utils.InternalArray;
-
 var MathMax;
 var MathMin;
 var ObjectHasOwnProperty;
+var ToNumber;
+var ToString;
 
 utils.Import(function(from) {
   MathMax = from.MathMax;
   MathMin = from.MathMin;
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
+  ToNumber = from.ToNumber;
+  ToString = from.ToString;
 });
 
 // -------------------------------------------------------------------
@@ -162,10 +165,10 @@ function JSONSerialize(key, holder, replacer, stack, indent, gap) {
     if (IS_ARRAY(value)) {
       return SerializeArray(value, replacer, stack, indent, gap);
     } else if (IS_NUMBER_WRAPPER(value)) {
-      value = $toNumber(value);
+      value = ToNumber(value);
       return JSON_NUMBER_TO_STRING(value);
     } else if (IS_STRING_WRAPPER(value)) {
-      return %QuoteJSONString($toString(value));
+      return %QuoteJSONString(ToString(value));
     } else if (IS_BOOLEAN_WRAPPER(value)) {
       return %_ValueOf(value) ? "true" : "false";
     } else {
@@ -194,7 +197,7 @@ function JSONStringify(value, replacer, space) {
       } else if (IS_NUMBER(v)) {
         item = %_NumberToString(v);
       } else if (IS_STRING_WRAPPER(v) || IS_NUMBER_WRAPPER(v)) {
-        item = $toString(v);
+        item = ToString(v);
       } else {
         continue;
       }
@@ -208,9 +211,9 @@ function JSONStringify(value, replacer, space) {
   if (IS_OBJECT(space)) {
     // Unwrap 'space' if it is wrapped
     if (IS_NUMBER_WRAPPER(space)) {
-      space = $toNumber(space);
+      space = ToNumber(space);
     } else if (IS_STRING_WRAPPER(space)) {
-      space = $toString(space);
+      space = ToString(space);
     }
   }
   var gap;
diff --git a/src/macros.py b/src/macros.py
index 090b9e0f7d..49b2cad8bd 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -145,9 +145,9 @@ define kBoundArgumentsStartIndex = 2;
 # Inline macros. Use %IS_VAR to make sure arg is evaluated only once.
 macro NUMBER_IS_NAN(arg) = (!%_IsSmi(%IS_VAR(arg)) && !(arg == arg));
 macro NUMBER_IS_FINITE(arg) = (%_IsSmi(%IS_VAR(arg)) || ((arg == arg) && (arg != 1/0) && (arg != -1/0)));
-macro TO_INTEGER(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToInteger($toNumber(arg)));
-macro TO_INTEGER_FOR_SIDE_EFFECT(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : $toNumber(arg));
-macro TO_INTEGER_MAP_MINUS_ZERO(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToIntegerMapMinusZero($toNumber(arg)));
+macro TO_INTEGER(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToInteger(ToNumber(arg)));
+macro TO_INTEGER_FOR_SIDE_EFFECT(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : ToNumber(arg));
+macro TO_INTEGER_MAP_MINUS_ZERO(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToIntegerMapMinusZero(ToNumber(arg)));
 macro TO_INT32(arg) = (arg | 0);
 macro TO_UINT32(arg) = (arg >>> 0);
 macro TO_STRING_INLINE(arg) = (IS_STRING(%IS_VAR(arg)) ? arg : $nonStringToString(arg));
diff --git a/src/messages.js b/src/messages.js
index a111660bc4..32766a89fe 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -22,38 +22,43 @@ var MakeURIError;
 // -------------------------------------------------------------------
 // Imports
 
-var GlobalObject = global.Object;
-var InternalArray = utils.InternalArray;
-var ObjectDefineProperty = utils.ObjectDefineProperty;
-
 var ArrayJoin;
+var Bool16x8ToString;
+var Bool32x4ToString;
+var Bool8x16ToString;
+var Float32x4ToString;
+var FunctionSourceString
+var GlobalObject = global.Object;
+var Int16x8ToString;
+var Int32x4ToString;
+var Int8x16ToString;
+var InternalArray = utils.InternalArray;
+var ObjectDefineProperty;
 var ObjectToString;
 var StringCharAt;
 var StringIndexOf;
 var StringSubstring;
-
-var Float32x4ToString;
-var Int32x4ToString;
-var Bool32x4ToString;
-var Int16x8ToString;
-var Bool16x8ToString;
-var Int8x16ToString;
-var Bool8x16ToString;
-
+var ToString;
 
 utils.Import(function(from) {
   ArrayJoin = from.ArrayJoin;
+  Bool16x8ToString = from.Bool16x8ToString;
+  Bool32x4ToString = from.Bool32x4ToString;
+  Bool8x16ToString = from.Bool8x16ToString;
+  Float32x4ToString = from.Float32x4ToString;
+  FunctionSourceString = from.FunctionSourceString;
+  Int16x8ToString = from.Int16x8ToString;
+  Int32x4ToString = from.Int32x4ToString;
+  Int8x16ToString = from.Int8x16ToString;
+  ObjectDefineProperty = from.ObjectDefineProperty;
   ObjectToString = from.ObjectToString;
   StringCharAt = from.StringCharAt;
   StringIndexOf = from.StringIndexOf;
   StringSubstring = from.StringSubstring;
-  Float32x4ToString = from.Float32x4ToString;
-  Int32x4ToString = from.Int32x4ToString;
-  Bool32x4ToString = from.Bool32x4ToString;
-  Int16x8ToString = from.Int16x8ToString;
-  Bool16x8ToString = from.Bool16x8ToString;
-  Int8x16ToString = from.Int8x16ToString;
-  Bool8x16ToString = from.Bool8x16ToString;
+});
+
+utils.ImportNow(function(from) {
+  ToString = from.ToString;
 });
 
 // -------------------------------------------------------------------
@@ -81,7 +86,7 @@ function NoSideEffectToString(obj) {
   if (IS_UNDEFINED(obj)) return 'undefined';
   if (IS_NULL(obj)) return 'null';
   if (IS_FUNCTION(obj)) {
-    var str = %_CallFunction(obj, obj, $functionSourceString);
+    var str = %_CallFunction(obj, obj, FunctionSourceString);
     if (str.length > 128) {
       str = %_SubString(str, 0, 111) + "...<omitted>..." +
             %_SubString(str, str.length - 2, str.length);
@@ -147,7 +152,7 @@ function ToStringCheckErrorObject(obj) {
   if (CanBeSafelyTreatedAsAnErrorObject(obj)) {
     return %_CallFunction(obj, ErrorToString);
   } else {
-    return $toString(obj);
+    return ToString(obj);
   }
 }
 
@@ -968,7 +973,7 @@ function DefineError(global, f) {
       // object. This avoids going through getters and setters defined
       // on prototype objects.
       if (!IS_UNDEFINED(m)) {
-        %AddNamedProperty(this, 'message', $toString(m), DONT_ENUM);
+        %AddNamedProperty(this, 'message', ToString(m), DONT_ENUM);
       }
     } else {
       return new f(m);
diff --git a/src/prologue.js b/src/prologue.js
index 3153db6e15..4906d41f3d 100644
--- a/src/prologue.js
+++ b/src/prologue.js
@@ -12,17 +12,16 @@
 // Utils
 
 var imports = UNDEFINED;
-var exports = UNDEFINED;
 var imports_from_experimental = UNDEFINED;
 var exports_to_runtime = UNDEFINED;
+var exports_container = {};
 
 // Export to other scripts.
 // In normal natives, this exports functions to other normal natives.
 // In experimental natives, this exports to other experimental natives and
 // to normal natives that import using utils.ImportFromExperimental.
 function Export(f) {
-  f.next = exports;
-  exports = f;
+  f(exports_container);
 }
 
 
@@ -32,7 +31,11 @@ function ExportToRuntime(f) {
   exports_to_runtime = f;
 }
 
-// Import from other scripts.
+
+// Import from other scripts. The actual importing happens in PostNatives and
+// PostExperimental so that we can import from scripts executed later. However,
+// that means that the import is not available until the very end. If the
+// import needs to be available immediate, use ImportNow.
 // In normal natives, this imports from other normal natives.
 // In experimental natives, this imports from other experimental natives and
 // whitelisted exports from normal natives.
@@ -41,6 +44,13 @@ function Import(f) {
   imports = f;
 }
 
+// Import immediately from exports of previous scripts. We need this for
+// functions called during bootstrapping. Hooking up imports in PostNatives
+// would be too late.
+function ImportNow(f) {
+  f(exports_container);
+}
+
 
 // In normal natives, import from experimental natives.
 // Not callable from experimental natives.
@@ -149,14 +159,12 @@ function SetUpLockedPrototype(
 // -----------------------------------------------------------------------
 // To be called by bootstrapper
 
-var experimental_exports = UNDEFINED;
-
 function PostNatives(utils) {
   %CheckIsBootstrapping();
 
-  var container = {};
-  for ( ; !IS_UNDEFINED(exports); exports = exports.next) exports(container);
-  for ( ; !IS_UNDEFINED(imports); imports = imports.next) imports(container);
+  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
+    imports(exports_container);
+  }
 
   var runtime_container = {};
   for ( ; !IS_UNDEFINED(exports_to_runtime);
@@ -165,9 +173,10 @@ function PostNatives(utils) {
   }
   %ImportToRuntime(runtime_container);
 
-  // Whitelist of exports from normal natives to experimental natives.
-  var expose_to_experimental = [
+  // Whitelist of exports from normal natives to experimental natives and debug.
+  var expose_list = [
     "ArrayToString",
+    "FunctionSourceString",
     "GetIterator",
     "GetMethod",
     "InnerArrayEvery",
@@ -190,15 +199,19 @@ function PostNatives(utils) {
     "ObjectDefineProperty",
     "OwnPropertyKeys",
     "ToNameArray",
+    "ToBoolean",
+    "ToNumber",
+    "ToString",
   ];
-  experimental_exports = {};
+
+  var filtered_exports = {};
   %OptimizeObjectForAddingMultipleProperties(
-      experimental_exports, expose_to_experimental.length);
-  for (var key of expose_to_experimental) {
-    experimental_exports[key] = container[key];
+      filtered_exports, expose_list.length);
+  for (var key of expose_list) {
+    filtered_exports[key] = exports_container[key];
   }
-  %ToFastProperties(experimental_exports);
-  container = UNDEFINED;
+  %ToFastProperties(filtered_exports);
+  exports_container = filtered_exports;
 
   utils.PostNatives = UNDEFINED;
   utils.ImportFromExperimental = UNDEFINED;
@@ -208,15 +221,12 @@ function PostNatives(utils) {
 function PostExperimentals(utils) {
   %CheckIsBootstrapping();
 
-  for ( ; !IS_UNDEFINED(exports); exports = exports.next) {
-    exports(experimental_exports);
-  }
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
-    imports(experimental_exports);
+    imports(exports_container);
   }
   for ( ; !IS_UNDEFINED(imports_from_experimental);
           imports_from_experimental = imports_from_experimental.next) {
-    imports_from_experimental(experimental_exports);
+    imports_from_experimental(exports_container);
   }
   var runtime_container = {};
   for ( ; !IS_UNDEFINED(exports_to_runtime);
@@ -225,7 +235,7 @@ function PostExperimentals(utils) {
   }
   %ImportExperimentalToRuntime(runtime_container);
 
-  experimental_exports = UNDEFINED;
+  exports_container = UNDEFINED;
 
   utils.PostExperimentals = UNDEFINED;
   utils.PostDebug = UNDEFINED;
@@ -235,13 +245,12 @@ function PostExperimentals(utils) {
 
 
 function PostDebug(utils) {
-  for ( ; !IS_UNDEFINED(exports); exports = exports.next) {
-    exports(experimental_exports);
-  }
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
-    imports(experimental_exports);
+    imports(exports_container);
   }
 
+  exports_container = UNDEFINED;
+
   utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
   utils.Import = UNDEFINED;
@@ -250,9 +259,10 @@ function PostDebug(utils) {
 
 // -----------------------------------------------------------------------
 
-%OptimizeObjectForAddingMultipleProperties(utils, 13);
+%OptimizeObjectForAddingMultipleProperties(utils, 14);
 
 utils.Import = Import;
+utils.ImportNow = ImportNow;
 utils.Export = Export;
 utils.ExportToRuntime = ExportToRuntime;
 utils.ImportFromExperimental = ImportFromExperimental;
diff --git a/src/regexp.js b/src/regexp.js
index bf75ca1b01..e717b26158 100644
--- a/src/regexp.js
+++ b/src/regexp.js
@@ -16,6 +16,10 @@ var harmony_unicode_regexps = false;
 var GlobalRegExp = global.RegExp;
 var InternalPackedArray = utils.InternalPackedArray;
 
+utils.Import(function(from) {
+  ToNumber = from.ToNumber;
+});
+
 // -------------------------------------------------------------------
 
 // Property of the builtins object for recording the result of the last
diff --git a/src/runtime.js b/src/runtime.js
index 20b608e907..683970a7f2 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -66,7 +66,6 @@ var $nonNumberToNumber;
 var $nonStringToString;
 var $sameValue;
 var $sameValueZero;
-var $toBoolean;
 var $toInteger;
 var $toLength;
 var $toName;
@@ -907,7 +906,6 @@ $nonNumberToNumber = NonNumberToNumber;
 $nonStringToString = NonStringToString;
 $sameValue = SameValue;
 $sameValueZero = SameValueZero;
-$toBoolean = ToBoolean;
 $toInteger = ToInteger;
 $toLength = ToLength;
 $toName = ToName;
@@ -917,10 +915,16 @@ $toPrimitive = ToPrimitive;
 $toString = ToString;
 
 utils.ExportToRuntime(function(to) {
-  to.ToNumber = $toNumber;
-  to.ToString = $toString;
-  to.ToInteger = $toInteger;
-  to.ToLength = $toLength;
+  to.ToNumber = ToNumber;
+  to.ToString = ToString;
+  to.ToInteger = ToInteger;
+  to.ToLength = ToLength;
 });
 
+utils.Export(function(to) {
+  to.ToBoolean = ToBoolean;
+  to.ToNumber = ToNumber;
+  to.ToString = ToString;
+})
+
 })
diff --git a/src/string.js b/src/string.js
index 20fff56b08..8e7fc6c01c 100644
--- a/src/string.js
+++ b/src/string.js
@@ -9,18 +9,19 @@
 // -------------------------------------------------------------------
 // Imports
 
+var ArrayIndexOf;
+var ArrayJoin;
 var GlobalRegExp = global.RegExp;
 var GlobalString = global.String;
 var InternalArray = utils.InternalArray;
 var InternalPackedArray = utils.InternalPackedArray;
-
-var ArrayIndexOf;
-var ArrayJoin;
 var MathMax;
 var MathMin;
 var RegExpExec;
 var RegExpExecNoTests;
 var RegExpLastMatchInfo;
+var ToNumber;
+var ToString;
 
 utils.Import(function(from) {
   ArrayIndexOf = from.ArrayIndexOf;
@@ -30,6 +31,8 @@ utils.Import(function(from) {
   RegExpExec = from.RegExpExec;
   RegExpExecNoTests = from.RegExpExecNoTests;
   RegExpLastMatchInfo = from.RegExpLastMatchInfo;
+  ToNumber = from.ToNumber;
+  ToString = from.ToString;
 });
 
 //-------------------------------------------------------------------
@@ -132,7 +135,7 @@ function StringLastIndexOfJS(pat /* position */) {  // length == 1
   var patLength = pat.length;
   var index = subLength - patLength;
   if (%_ArgumentsLength() > 1) {
-    var position = $toNumber(%_Arguments(1));
+    var position = ToNumber(%_Arguments(1));
     if (!NUMBER_IS_NAN(position)) {
       position = TO_INTEGER(position);
       if (position < 0) {
@@ -823,7 +826,7 @@ function StringTrimRight() {
 function StringFromCharCode(code) {
   var n = %_ArgumentsLength();
   if (n == 1) {
-    if (!%_IsSmi(code)) code = $toNumber(code);
+    if (!%_IsSmi(code)) code = ToNumber(code);
     return %_StringCharFromCode(code & 0xffff);
   }
 
@@ -831,7 +834,7 @@ function StringFromCharCode(code) {
   var i;
   for (i = 0; i < n; i++) {
     var code = %_Arguments(i);
-    if (!%_IsSmi(code)) code = $toNumber(code) & 0xffff;
+    if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff;
     if (code < 0) code = code & 0xffff;
     if (code > 0xff) break;
     %_OneByteSeqStringSetChar(i, code, one_byte);
@@ -842,7 +845,7 @@ function StringFromCharCode(code) {
   var two_byte = %NewString(n - i, NEW_TWO_BYTE_STRING);
   for (var j = 0; i < n; i++, j++) {
     var code = %_Arguments(i);
-    if (!%_IsSmi(code)) code = $toNumber(code) & 0xffff;
+    if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff;
     %_TwoByteSeqStringSetChar(j, code, two_byte);
   }
   return one_byte + two_byte;
@@ -1088,7 +1091,7 @@ function StringFromCodePoint(_) {  // length = 1
   for (index = 0; index < length; index++) {
     code = %_Arguments(index);
     if (!%_IsSmi(code)) {
-      code = $toNumber(code);
+      code = ToNumber(code);
     }
     if (code < 0 || code > 0x10FFFF || code !== TO_INTEGER(code)) {
       throw MakeRangeError(kInvalidCodePoint, code);
@@ -1117,13 +1120,13 @@ function StringRaw(callSite) {
   var literalSegments = $toLength(raw.length);
   if (literalSegments <= 0) return "";
 
-  var result = $toString(raw[0]);
+  var result = ToString(raw[0]);
 
   for (var i = 1; i < literalSegments; ++i) {
     if (i < numberOfSubstitutions) {
-      result += $toString(%_Arguments(i));
+      result += ToString(%_Arguments(i));
     }
-    result += $toString(raw[i]);
+    result += ToString(raw[i]);
   }
 
   return result;
diff --git a/src/symbol.js b/src/symbol.js
index 5c5ec007af..8cac2c56a2 100644
--- a/src/symbol.js
+++ b/src/symbol.js
@@ -23,11 +23,12 @@ var $symbolToString;
 
 var GlobalObject = global.Object;
 var GlobalSymbol = global.Symbol;
-
 var ObjectGetOwnPropertyKeys;
+var ToString;
 
 utils.Import(function(from) {
   ObjectGetOwnPropertyKeys = from.ObjectGetOwnPropertyKeys;
+  ToString = from.ToString;
 });
 
 // -------------------------------------------------------------------
@@ -35,7 +36,7 @@ utils.Import(function(from) {
 function SymbolConstructor(x) {
   if (%_IsConstructCall()) throw MakeTypeError(kNotConstructor, "Symbol");
   // NOTE: Passing in a Symbol value will throw on ToString().
-  return %CreateSymbol(IS_UNDEFINED(x) ? x : $toString(x));
+  return %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x));
 }
 
 
diff --git a/src/typedarray.js b/src/typedarray.js
index 8e18b5e66e..d1f7ed1fdb 100644
--- a/src/typedarray.js
+++ b/src/typedarray.js
@@ -37,10 +37,12 @@ TYPED_ARRAYS(DECLARE_GLOBALS)
 
 var MathMax;
 var MathMin;
+var ToNumber;
 
 utils.Import(function(from) {
   MathMax = from.MathMax;
   MathMin = from.MathMin;
+  ToNumber = from.ToNumber;
 });
 
 var InternalArray = utils.InternalArray;
diff --git a/src/uri.js b/src/uri.js
index 4566a7cc96..bf3270f1d0 100644
--- a/src/uri.js
+++ b/src/uri.js
@@ -17,6 +17,11 @@
 var GlobalObject = global.Object;
 var GlobalArray = global.Array;
 var InternalArray = utils.InternalArray;
+var ToString;
+
+utils.Import(function(from) {
+  ToString = from.ToString;
+});
 
 // -------------------------------------------------------------------
 // Define internal helper functions.
@@ -274,13 +279,13 @@ function Decode(uri, reserved) {
 
 // ECMA-262 - B.2.1.
 function URIEscapeJS(str) {
-  var s = $toString(str);
+  var s = ToString(str);
   return %URIEscape(s);
 }
 
 // ECMA-262 - B.2.2.
 function URIUnescapeJS(str) {
-  var s = $toString(str);
+  var s = ToString(str);
   return %URIUnescape(s);
 }
 
@@ -304,14 +309,14 @@ function URIDecode(uri) {
 
     return false;
   };
-  var string = $toString(uri);
+  var string = ToString(uri);
   return Decode(string, reservedPredicate);
 }
 
 // ECMA-262 - 15.1.3.2.
 function URIDecodeComponent(component) {
   var reservedPredicate = function(cc) { return false; };
-  var string = $toString(component);
+  var string = ToString(component);
   return Decode(string, reservedPredicate);
 }
 
@@ -338,7 +343,7 @@ function URIEncode(uri) {
 
     return false;
   };
-  var string = $toString(uri);
+  var string = ToString(uri);
   return Encode(string, unescapePredicate);
 }
 
@@ -359,7 +364,7 @@ function URIEncodeComponent(component) {
 
     return false;
   };
-  var string = $toString(component);
+  var string = ToString(component);
   return Encode(string, unescapePredicate);
 }
 
diff --git a/src/v8natives.js b/src/v8natives.js
index 9d37e7cf6d..93636d008f 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var $functionSourceString;
-
 (function(global, utils) {
 
 %CheckIsBootstrapping();
@@ -17,16 +15,24 @@ var GlobalFunction = global.Function;
 var GlobalNumber = global.Number;
 var GlobalObject = global.Object;
 var InternalArray = utils.InternalArray;
-
 var MathAbs;
 var ProxyDelegateCallAndConstruct;
 var ProxyDerivedHasOwnTrap;
 var ProxyDerivedKeysTrap;
 var StringIndexOf;
+var ToBoolean;
+var ToNumber;
+var ToString;
 
 utils.Import(function(from) {
   MathAbs = from.MathAbs;
   StringIndexOf = from.StringIndexOf;
+  ToString = from.ToString;
+});
+
+utils.ImportNow(function(from) {
+  ToBoolean = from.ToBoolean;
+  ToNumber = from.ToNumber;
 });
 
 utils.ImportFromExperimental(function(from) {
@@ -346,11 +352,11 @@ function ToPropertyDescriptor(obj) {
   var desc = new PropertyDescriptor();
 
   if ("enumerable" in obj) {
-    desc.setEnumerable($toBoolean(obj.enumerable));
+    desc.setEnumerable(ToBoolean(obj.enumerable));
   }
 
   if ("configurable" in obj) {
-    desc.setConfigurable($toBoolean(obj.configurable));
+    desc.setConfigurable(ToBoolean(obj.configurable));
   }
 
   if ("value" in obj) {
@@ -358,7 +364,7 @@ function ToPropertyDescriptor(obj) {
   }
 
   if ("writable" in obj) {
-    desc.setWritable($toBoolean(obj.writable));
+    desc.setWritable(ToBoolean(obj.writable));
   }
 
   if ("get" in obj) {
@@ -612,7 +618,7 @@ function DefineProxyProperty(obj, p, attributes, should_throw) {
 
   var handler = %GetHandler(obj);
   var result = CallTrap2(handler, "defineProperty", UNDEFINED, p, attributes);
-  if (!$toBoolean(result)) {
+  if (!ToBoolean(result)) {
     if (should_throw) {
       throw MakeTypeError(kProxyHandlerReturned,
                           handler, "false", "defineProperty");
@@ -801,7 +807,7 @@ function DefineArrayProperty(obj, p, desc, should_throw) {
   if (!IS_SYMBOL(p)) {
     var index = TO_UINT32(p);
     var emit_splice = false;
-    if ($toString(index) == p && index != 4294967295) {
+    if (ToString(index) == p && index != 4294967295) {
       var length = obj.length;
       if (index >= length && %IsObserved(obj)) {
         emit_splice = true;
@@ -969,7 +975,7 @@ function ObjectGetOwnPropertyKeys(obj, filter) {
         }
       } else {
         if (filter & PROPERTY_ATTRIBUTES_STRING) continue;
-        name = $toString(name);
+        name = ToString(name);
       }
       if (seenKeys[name]) continue;
       seenKeys[name] = true;
@@ -1337,9 +1343,9 @@ utils.InstallFunctions(GlobalObject, DONT_ENUM, [
 
 function BooleanConstructor(x) {
   if (%_IsConstructCall()) {
-    %_SetValueOf(this, $toBoolean(x));
+    %_SetValueOf(this, ToBoolean(x));
   } else {
-    return $toBoolean(x);
+    return ToBoolean(x);
   }
 }
 
@@ -1385,7 +1391,7 @@ utils.InstallFunctions(GlobalBoolean.prototype, DONT_ENUM, [
 // Number
 
 function NumberConstructor(x) {
-  var value = %_ArgumentsLength() == 0 ? 0 : $toNumber(x);
+  var value = %_ArgumentsLength() == 0 ? 0 : ToNumber(x);
   if (%_IsConstructCall()) {
     %_SetValueOf(this, value);
   } else {
@@ -1498,7 +1504,7 @@ function NumberToPrecisionJS(precision) {
     // Get the value of this number in case it's an object.
     x = %_ValueOf(this);
   }
-  if (IS_UNDEFINED(precision)) return $toString(%_ValueOf(this));
+  if (IS_UNDEFINED(precision)) return ToString(%_ValueOf(this));
   var p = TO_INTEGER(precision);
 
   if (NUMBER_IS_NAN(x)) return "NaN";
@@ -1718,9 +1724,9 @@ function NewFunctionString(args, function_token) {
   var n = args.length;
   var p = '';
   if (n > 1) {
-    p = $toString(args[0]);
+    p = ToString(args[0]);
     for (var i = 1; i < n - 1; i++) {
-      p += ',' + $toString(args[i]);
+      p += ',' + ToString(args[i]);
     }
     // If the formal parameters string include ) - an illegal
     // character - it may make the combined function expression
@@ -1733,7 +1739,7 @@ function NewFunctionString(args, function_token) {
     // comments we can include a trailing block comment to catch this.
     p += '\n/' + '**/';
   }
-  var body = (n > 0) ? $toString(args[n - 1]) : '';
+  var body = (n > 0) ? ToString(args[n - 1]) : '';
   return '(' + function_token + '(' + p + ') {\n' + body + '\n})';
 }
 
@@ -1782,19 +1788,16 @@ function GetIterator(obj, method) {
 // ----------------------------------------------------------------------------
 // Exports
 
-$functionSourceString = FunctionSourceString;
-
-utils.ObjectDefineProperties = ObjectDefineProperties;
-utils.ObjectDefineProperty = ObjectDefineProperty;
-
 utils.Export(function(to) {
   to.Delete = Delete;
+  to.FunctionSourceString = FunctionSourceString;
   to.GetIterator = GetIterator;
   to.GetMethod = GetMethod;
   to.IsFinite = GlobalIsFinite;
   to.IsNaN = GlobalIsNaN;
   to.NewFunctionString = NewFunctionString;
   to.NumberIsNaN = NumberIsNaN;
+  to.ObjectDefineProperties = ObjectDefineProperties;
   to.ObjectDefineProperty = ObjectDefineProperty;
   to.ObjectFreeze = ObjectFreezeJS;
   to.ObjectGetOwnPropertyKeys = ObjectGetOwnPropertyKeys;