Fix string HTML methods to call ToString

src/string.js

Index: src/string.js
diff --git a/src/string.js b/src/string.js
index 9798846dc7be3e8e74012fa8be23e259857a162d..cf70d40c85b8f165c14216f025ce40da703f4891 100644
--- a/src/string.js
+++ b/src/string.js
@@ -853,91 +853,94 @@ function HtmlEscape(str) {
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.2
 function StringAnchor(name) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.anchor");
-  return "<a name=\"" + HtmlEscape(name) + "\">" + this + "</a>";
+  return "<a name=\"" + HtmlEscape(name) + "\">" + TO_STRING_INLINE(this) +
+         "</a>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.3
 function StringBig() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.big");
-  return "<big>" + this + "</big>";
+  return "<big>" + TO_STRING_INLINE(this) + "</big>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.4
 function StringBlink() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.blink");
-  return "<blink>" + this + "</blink>";
+  return "<blink>" + TO_STRING_INLINE(this) + "</blink>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.5
 function StringBold() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.bold");
-  return "<b>" + this + "</b>";
+  return "<b>" + TO_STRING_INLINE(this) + "</b>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.6
 function StringFixed() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.fixed");
-  return "<tt>" + this + "</tt>";
+  return "<tt>" + TO_STRING_INLINE(this) + "</tt>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.7
 function StringFontcolor(color) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.fontcolor");
-  return "<font color=\"" + HtmlEscape(color) + "\">" + this + "</font>";
+  return "<font color=\"" + HtmlEscape(color) + "\">" + TO_STRING_INLINE(this) +
+         "</font>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.8
 function StringFontsize(size) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.fontsize");
-  return "<font size=\"" + HtmlEscape(size) + "\">" + this + "</font>";
+  return "<font size=\"" + HtmlEscape(size) + "\">" + TO_STRING_INLINE(this) +
+         "</font>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.9
 function StringItalics() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.italics");
-  return "<i>" + this + "</i>";
+  return "<i>" + TO_STRING_INLINE(this) + "</i>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.10
 function StringLink(s) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.link");
-  return "<a href=\"" + HtmlEscape(s) + "\">" + this + "</a>";
+  return "<a href=\"" + HtmlEscape(s) + "\">" + TO_STRING_INLINE(this) + "</a>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.11
 function StringSmall() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.small");
-  return "<small>" + this + "</small>";
+  return "<small>" + TO_STRING_INLINE(this) + "</small>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.12
 function StringStrike() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.strike");
-  return "<strike>" + this + "</strike>";
+  return "<strike>" + TO_STRING_INLINE(this) + "</strike>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.13
 function StringSub() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.sub");
-  return "<sub>" + this + "</sub>";
+  return "<sub>" + TO_STRING_INLINE(this) + "</sub>";
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.14
 function StringSup() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.sup");
-  return "<sup>" + this + "</sup>";
+  return "<sup>" + TO_STRING_INLINE(this) + "</sup>";
 }
 
 // ES6 draft 01-20-14, section 21.1.3.13