public void put(String name, Scriptable start, Object value)
    {
        int info = findInstanceIdInfo(name);
        if (info != 0) {
            if (start == this && isSealed()) {
                throw Context.reportRuntimeError1("msg.modify.sealed",
                                                  name);
            }
            int attr = (info >>> 16);
            if ((attr & READONLY) == 0) {
                if (start == this) {
                    int id = (info & 0xFFFF);
                    setInstanceIdValue(id, value);
                }
                else {
                    start.put(name, start, value);
                }
            }
            return;
        }
        if (prototypeValues != null) {
            int id = prototypeValues.findId(name);
            if (id != 0) {
                if (start == this && isSealed()) {
                    throw Context.reportRuntimeError1("msg.modify.sealed",
                                                      name);
                }
                prototypeValues.set(id, start, value);
                return;
            }
        }
        super.put(name, start, value);
    }