(str) Forwarding append methods in String{Buffer,Builder} are inconsist

I noticed some other
inconsistencies in those forwarding append methods that
perhaps should all be of the form:

append(ARG...) {
   super.append(ARG...);
   return this;
}

but this one in StringBuilder doesn't forward.

     /**
      * @throws IndexOutOfBoundsException {@inheritDoc}
      */
     public StringBuilder append(CharSequence s) {
         if (s == null)
             s = "null";
         if (s instanceof String)
             return this.append((String)s);
         if (s instanceof StringBuffer)
             return this.append((StringBuffer)s);
         if (s instanceof StringBuilder)
             return this.append((StringBuilder)s);
         return this.append(s, 0, s.length());
     }

Its super variant in AbstractStringBuilder doesn't
deal with StringBuilders.

     // Documentation in subclasses because of synchro difference
     public AbstractStringBuilder append(CharSequence s) {
         if (s == null)
             s = "null";
         if (s instanceof String)
             return this.append((String)s);
         if (s instanceof StringBuffer)
             return this.append((StringBuffer)s);
         return this.append(s, 0, s.length());
     }

What happens when you append a StringBuilder to a StringBuffer?

StringBuilder.java:
     /**
      * @see java.lang.String#valueOf(java.lang.Object)
      * @see #append(java.lang.String)
      */
     public StringBuilder append(Object obj) {
return append(String.valueOf(obj));
     }


StringBuffer.java:
     /**
      * @see java.lang.String#valueOf(java.lang.Object)
      * @see #append(java.lang.String)
      */
     public synchronized StringBuffer append(Object obj) {
super.append(String.valueOf(obj));
         return this;
     }

###@###.### 2004-12-09 23:26:40 GMT