*) TYPED-IDENTITY - new fsubr specifies type of a random quantity.
   (TYPED-IDENTITY FIXNUM x) requires that x evaluate to something of
   type FIXNUM;  (TYPED-IDENTITY FLONUM x) similarly requires FLONUM.


*) ERROR-BREAK-ENVIRONMENT - sets OBARRAY/READTABLE for ↑B and error loops.
   As a special variable, ERROR-BREAK-ENVIRONMENT holds a pair (cons pair)
   of an obarray and readtable to use during the system-supplied ↑B break and
   error handlers.   Its initial setting is 
	`(,(get 'OBARRAY 'ARRAY) ,(get 'READTABLE 'ARRAY))

*) DEFAULTF no longer manipulated by LOAD or FASLOAD, and new initial value.
   This has the consequence that only the "oldio" compatibility functions
   change DEFAULTF (namely, UREAD, UWRITE, UFILE, UKILL).  Furthermore, its 
   initial setting will be
	`((DSK ,(status udir)) * >)	;ITS
	`((DSK ,(status udir)) * LSP)	;TOPS-10/CMU
	`((PS  ,(status udir)) * LSP)	;TOPS-20/TENEX
	`((DSK ,(status udir)) * ←←←)	;SAIL (kludge, meaning no extension)

*) Splicing macros which return a singleton list may now appear at top level.
   also may appear just after a "dot" for a dotted pair.
   At top level, if a splicing macro returns a list of one element,
   then READ returns that element just as if it were read primitively;
   the same holds true for splicing macros just after a dotted-pair dot.
   E.g., if "}" is defined as (SETSYNTAX '/} 'SPLICING '(LAMBDA () (READ)))
   then   (A . }(B))  reads in the same as  (A . B)

*) DEFMACRO usages no longer cause automatic loading of DEFMAX file.
   Since LISPs prior to about version 1832 did not have autoload properties
   for the auxillary functions needed by DEFMACRO-defined macros, then
   each such macro explicitly tried to load the DEFMAX file if not already
   loaded.  If you see a message about 
	"|forget-macromemos/|| Undefined Function"
   it is probably because you are using DEFMACRO output in an old LISP
   (and some of the system code does depend upon DEFMACRO, e.g. LET)


*) DEFUN& and DEFMACRO admits a "supplied-p" variable for &OPTIONAL variables.
   The format "(binding default-value flag-variable)"  used in a place where a
   &OPTIONAL variable would be used, causes the symbol "flag-variable" to be
   bound to T if that optional argument is actually supplied, and to null
   otherwise.  Example:
	(DEFUN FOO (&OPTIONAL (Z () ZP?)) ... )
   causes "ZP?" to be non-null for those calls to FOO with an argument.

*) New COMPLR switch "}", controlling the variable QUIT-ON-ERROR
   Generally, if an *error* (as opposed to a warning condition)
   is discovered, the COMPLR will go into a BREAK loop, awaiting
   further intervention by the user.  But if the value of the
   variable QUIT-ON-ERROR is non-null, it will merely do a (QUIT);
   The initial value of this variable is ().

*) New UUO "STRT7" for typing out ascii strings.  Works similar to "STRT".
   Compiler variable "USE-STRT7", controlled by the "7" switch, selects
   the use "STRT7" rather than "STRT" (which is for sixbit formats).ββ