IE8 StringBuilder toString bugfix

Before :
var t = new ss.StringBuilder;
t.appendLine("toString overriden"),
var s = t.toString(); // IE8 returns [object Object]

After :
var t = new ss.StringBuilder;
t.appendLine("IE8 toString override bug"),
var s = t.toString(); // IE8 returns "toString overriden"

More informations on this bug :
http://stackoverflow.com/questions/6821354/issues-with-object-tostring-in-ie8-backbone-js

Runtime scripts :
I have search for every "toString" that was overriden in scriptsharp "Runtime scripts" 
but only found this one.

Compiled scripts :
ScriptSharp compiler prevent overriding "toString" with a "Your C# source code use an 
unsupported feature" error.

Thanks for your time.
Regards
Luc