add discouraged use example

peps/pep-0467.rst

@@ -56,10 +56,12 @@ Proposals
 Addition of explicit "count and byte initialised sequence" constructors
 -----------------------------------------------------------------------
 
-To replace the now discouraged behavior, this PEP proposes the addition of an
-explicit ``fromsize`` alternative constructor as a class method on both
-``bytes`` and ``bytearray`` whose first argument is the count, and whose
-second argument is the fill byte to use (defaults to ``\x00``)::
+To replace the discouraged behavior of creating zero-filled ``bytes``-like
+objects from the basic constructors (i.e. ``bytes(1)`` --> ``b'\x00'``), this
+PEP proposes the addition of an explicit ``fromsize`` alternative constructor
+as a class method on both ``bytes`` and ``bytearray`` whose first argument
+is the count, and whose second argument is the fill byte to use (defaults
+to ``\x00``)::
 
     >>> bytes.fromsize(3)
     b'\x00\x00\x00'