Issue: STREAM-ELEMENT-TYPE-EXAMPLES

[David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>]

Note that in many cases, the Common Lisp language does not specify
any particular value to be returned by STREAM-ELEMENT-TYPE.  The
function exists so you can find out what implementation-dependent
element type you got, not so you can store an object with OPEN
and read it back with STREAM-ELEMENT-TYPE.

The Common Lisp language also does not specify which of several
equivalent type specifiers (e.g. BIT, (INTEGER 0 1), (INTEGER 0 (2)),
(MEMBER 0 1)) is returned.

We need to be careful of putting examples in documentation that
imply that the language specification is more restrictive than
it was intended to be.