master 3c0c47b: Revert "Switch add-to-ordered-list to eql"

[Lars Ingebrigtsen]

branch: master
commit 3c0c47b3a74c4ea851293d0869f956a4644af062
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Revert "Switch add-to-ordered-list to eql"
    
    This reverts commit b4fd857ead728a06380250c5336c1ab94a7c2f7a.
    
    I misunderstood the purposed of the function.
---
 doc/lispref/lists.texi | 2 +-
 etc/NEWS               | 2 --
 lisp/subr.el           | 4 ++--
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/doc/lispref/lists.texi b/doc/lispref/lists.texi
index 2e5b193..ae793d5 100644
--- a/doc/lispref/lists.texi
+++ b/doc/lispref/lists.texi
@@ -812,7 +812,7 @@ This function sets the variable @var{symbol} by inserting
 @var{element} into the old value, which must be a list, at the
 position specified by @var{order}.  If @var{element} is already a
 member of the list, its position in the list is adjusted according
-to @var{order}.  Membership is tested using @code{eql}.
+to @var{order}.  Membership is tested using @code{eq}.
 This function returns the resulting list, whether updated or not.
 
 The @var{order} is typically a number (integer or float), and the
diff --git a/etc/NEWS b/etc/NEWS
index e418999..0231c16 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1861,8 +1861,6 @@ directory instead of the default directory.
 
 * Incompatible Lisp Changes in Emacs 28.1
 
-** 'add-to-ordered-list' now uses 'eql' instead of 'eq'.
-
 ** 'set-process-buffer' now updates the process mark.
 The mark will be set to point to the end of the new buffer.
 
diff --git a/lisp/subr.el b/lisp/subr.el
index b3f00cc..384dbb25 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1973,7 +1973,7 @@ can do the job."
 
 (defun add-to-ordered-list (list-var element &optional order)
   "Add ELEMENT to the value of LIST-VAR if it isn't there yet.
-The test for presence of ELEMENT is done with `eql'.
+The test for presence of ELEMENT is done with `eq'.
 
 The resulting list is reordered so that the elements are in the
 order given by each element's numeric list order.  Elements
@@ -1993,7 +1993,7 @@ The return value is the new value of LIST-VAR."
   (let ((ordering (get list-var 'list-order)))
     (unless ordering
       (put list-var 'list-order
-           (setq ordering (make-hash-table :weakness 'key))))
+           (setq ordering (make-hash-table :weakness 'key :test 'eq))))
     (when order
       (puthash element (and (numberp order) order) ordering))
     (unless (memq element (symbol-value list-var))