It appears that "String" is somewhat of a reserved name in pyjamas. I had a class called String (which is fine in Python) but in the compiled code it inadvertently uses the built in javascript String object instead of my String class.
$cls_definition['firstname'] = (typeof String == "undefined"?$m.String:String)(); Python code looks something like this: class String: pass class Foo: firstname = String() As you can see in the compiled line earlier, there is a check if String exists in the javascript namespace before it checks the $m namespace. So, my String classes never gets used. - lex
