Built-in JSON support

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 9772e2f0c28d27bd433dffa03c2a663ed4ea4f09..9ed6558473e92e206ebc3d41415b3446c444e671 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -312,13 +312,19 @@ function BooleanValueOf() {
 }
 
 
+function BooleanToJSON(key) {
+  return CheckJSONPrimitive(this.valueOf());
+}
+
+
 // ----------------------------------------------------------------------------
 
 
 function SetupBoolean() {
   InstallFunctions($Boolean.prototype, DONT_ENUM, $Array(
     "toString", BooleanToString,
-    "valueOf", BooleanValueOf
+    "valueOf", BooleanValueOf,
+    "toJSON", BooleanToJSON
   ));
 }
 
@@ -418,6 +424,18 @@ function NumberToPrecision(precision) {
 }
 
 
+function CheckJSONPrimitive(val) {
+  if (!IsPrimitive(val))
+    throw MakeTypeError('result_not_primitive', ['toJSON', val]);
+  return val;
+}
+
+
+function NumberToJSON(key) {
+  return CheckJSONPrimitive(this.valueOf());
+}
+
+
 // ----------------------------------------------------------------------------
 
 function SetupNumber() {
@@ -455,7 +473,8 @@ function SetupNumber() {
     "valueOf", NumberValueOf,
     "toFixed", NumberToFixed,
     "toExponential", NumberToExponential,
-    "toPrecision", NumberToPrecision
+    "toPrecision", NumberToPrecision,
+    "toJSON", NumberToJSON
   ));
 }