Revert "object: rename"

This makes things much slower for questionable benefit. A better
version might use a hash table. A better interpreter would use
some form of partial evaluation to optimize the EQ? chain.

This reverts commit 4acea69841.

linked-list.scm

@@ -27,7 +27,7 @@
         ((head '())
          (tail '())
          (this
-          (object/abstract
+          (object/immutable-attributes
            'push!
            (lambda (val)
              (set! head (cons val head))

object.scm

@@ -41,7 +41,6 @@
                  (if (not proc)
                      (error 'object 'invalid-op op args)
                      (apply proc args))))))
-
         (lambda (op . args)
           (let ((proc (table 'get op)))
             (if (not proc)
@@ -65,14 +64,11 @@
                       (apply process-args args)))))
         (apply check-args args)))))
 
-(define object-make-abstract!
-  (lambda (obj)
-    (obj 'delete! 'set!)
-    (obj 'delete! 'get)
-    (obj 'delete! 'delete!)
-    obj))
-
 ;;; Like OBJECT/ATTRIBUTES, but with SET!, GET, and DELETE! removed.
-(define object/abstract
+(define object/immutable-attributes
   (lambda args
-    (object-make-abstract! (apply object/attributes args))))
+    (let ((obj (apply object/attributes args)))
+      (obj 'delete! 'set!)
+      (obj 'delete! 'get)
+      (obj 'delete! 'delete!)
+      obj)))

read.scm

@@ -77,7 +77,7 @@
              (datum-labels '())
              (fold-case? #f)
              (this
-              (object/abstract
+              (object/immutable-attributes
                'process
                (lambda (ch)
                  (this 'update-position! ch)