Align serialization format with EcmaScript (#254)

Author: sadym-chromium

index.bs

@@ -1099,7 +1099,7 @@ StringValue = {
   value: text,
 }
 
-SpecialNumber = "NaN" / "-0" / "+Infinity" / "-Infinity";
+SpecialNumber = "NaN" / "-0" / "Infinity" / "-Infinity";
 
 NumberValue = {
   type: "number",
@@ -1152,8 +1152,8 @@ To <dfn>serialize primitive protocol value</dfn> given a |value|:
         <dd>Let |serialized| be <code>"NaN"</code>
         <dt>-0
         <dd>Let |serialized| be <code>"-0"</code>
-        <dt>+Infinity
-        <dd>Let |serialized| be <code>"+Infinity"</code>
+        <dt>Infinity
+        <dd>Let |serialized| be <code>"Infinity"</code>
         <dt>-Infinity
         <dd>Let |serialized| be <code>"-Infinity"</code>
         <dt>Otherwise: