memory leaks in Tkinter

[Maric MICHAUD]

I noticied some memory leak in text widget of Tkinter :

    Python 2.1.1 (#1, Aug 30 2001, 17:36:05) 
    [GCC 2.96 20000731 (Mandrake Linux 8.1 2.96-0.61mdk)] on linux-i386
    Type "copyright", "credits" or "license" for more information.
    >>> s=open("a big file").read()
    >>> import Tkinter
    >>> t=Tkinter.Tk()
    >>> x=Tkinter.Text(t)
    >>> x.pack()
    >>> x.insert(end, s)		# growing up memory to a little
more than size of s
    >>> x.delete(1.0, end)	# does not free memory
    >>> x.insert(end, s)        	# memory goes up again
    >>> x.delete(1.0, end)    	# memory freed by only one s
    >>> 

Is this a bug ? A problem with the version 1.152 of Tkinter ?