anchor.diff:    (warn 'deprecated-feature :feature #'remove-property :version "3.0.2")
     (property-makunbound object property-name))
   
  +(defun remove-all-direct-properties (object)
  +  "Wipes out all direct properties and their values from OBJECT."
  +  (if (std-object-p object)
  +      (std-sheeple:remove-all-direct-properties object)
  +      (smop:remove-all-direct-properties (object-metaobject object) object)))
   (defun std-sheeple:remove-all-direct-properties (object)
     (change-mold object (ensure-mold (object-parents object) #()))
     object)
  -(defun remove-all-direct-properties (object)
  -  "Wipes out all direct properties and their values from OBJECT."
  -  (if (std-object-p object)
  -      (std-sheeple:remove-all-direct-properties object)
  -      (smop:remove-all-direct-properties (object-metaobject object) object)))
   
   
   ;;;
   ;;; Value
   ;;;
  +(defun property-value (object property-name)
  +  "Returns the property-value for PROPERTY-NAME found first in OBJECT's hierarchy list.
  +If the value does not exist in the hierarchy list, a condition of type `unbound-property'
  +is signaled."
  +  (if (std-object-p object)
  +      (std-sheeple:property-value object property-name)
  +      (smop:property-value (object-metaobject object) object property-name)))
   (defun std-sheeple:property-value (object property-name)
     (check-type property-name symbol)
     (dolist (ancestor (object-hierarchy-list object)
  
positive.code:                                   (remove property-name
                                            (mold-properties (%object-mold object))))))
        (error 'unbound-property :object object :property-name property-name)))
  (defun property-makunbound (object property-name)
    "Removes OBJECT's direct property named PROPERTY-NAME. Signals an error if there is no such
  direct property. Returns OBJECT."
    (if (std-object-p object)
        (std-sheeple:property-makunbound object property-name)
        (smop:property-makunbound (object-metaobject object) object property-name)))
  
  (defun remove-property (object property-name)
    "Removes OBJECT's direct property named PROPERTY-NAME. Signals an error if there is no such
  
negative.code: ;;;
  ;;; Existential
  ;;;
  (defun direct-property-value (object property-name)
    "Returns the property-value set locally in OBJECT for PROPERTY-NAME. If the
  property is not set locally, a condition of type `unbound-property' is signaled."
    (if (std-object-p object)
        (std-sheeple:direct-property-value object property-name)
        (smop:direct-property-value (object-metaobject object) property-name)))
  (defun std-sheeple:direct-property-value (object property-name)
    (check-type property-name symbol)
    (aif (property-position property-name object)
  