Currently, JS error messages are very confusing for users; e.g.:

Tue Feb 19 11:40:29.554 [conn3] JavaScript execution failed: SyntaxError: Unexpected identifier _funcs9:1

This is partially because we specify an arbitrary variable name (e.g. funcs9) as the script context/filename in V8Scope::_createFunction(). This should either be removed, or toSTLString(v8::TryCatch*) should access the code from the scope's map and parse the start/end position to provide the context reported by v8.