anchor.diff:  
              ;; Helpers
              :wrap-value
  +           :unwrap-value
              :apply-unwrapped-values
              :apply-unwrapped-values-prefer-bool
              :switch-mal-type))
  
positive.code:                    do (setf (gethash (mal-data-value key) hash-table)
                              (mal-data-value (gethash key hash-map-value))))
                  hash-table))
      (any (mal-data-value value))))
  
  (defun apply-unwrapped-values (op &rest values)
  
negative.code: ;; Dummy package where MAL variables are interned
  (defpackage :mal-user
    (:use :common-lisp))
  
  (defpackage :types
    (:use :common-lisp)
    (:export :mal-value=
  