New/Changed Data Types

• NIL -- was treated as a special case, now just a normal symbol.
• symbols -- value binding can optionally be constant or special. "*unbound*" is no longer a symbol so does not have to be specially treated.
• ratio numbers -- new type.
• complex numbers -- new type, can be integer or real.
• character strings -- The ASCII NUL (code 0) is now a valid character.
• objects -- objects of class Class have a new instance variable which is the print name of the class.
• hash-table -- new type, close to CL
• random-state -- new type, CL
• Property list properties are no longer limited to just symbols CL
• Multiple value returns added where appropriate
• Packages added where appropriate