bug#58338: 29.0.50; mapatoms called on more elements than in obarray?

[Philip Kaludercic]

>From reading the docstring of `mapatoms', I would assume that this would
evaluate to t:

(let ((i 0))
  (mapatoms (lambda (_) (setq i (1+ i))) obarray)
  (= (length obarray) i))

But instead on my system I get (length obarray) ↝ 15121 and and i ↝
78050, which is are at a ratio of 5.16169565505.

Also interesting, if I intern a variable "foo", the value of i increases
to 83106, while (length obarray) stays the same (?)

Interestingly enough, I'd expect this to at least output a single
message:

(let ((ht (make-hash-table)))
  (mapatoms (lambda (s) (cl-incf (gethash s ht 0))))
  (maphash (lambda (sym i)
             (when (> i 1)
               (message "%S: %d" sym i)))
           ht))

but apparently no symbol is invoked twice.  Not even by name

(let ((ht (make-hash-table :test #'equal)))
  (mapatoms (lambda (s) (cl-incf (gethash (symbol-name s) ht 0))))
  (maphash (lambda (sym i)
             (when (> i 1)
               (message "%S: %d" sym i)))
           ht))

Is this perhaps related to symbol positions?  I don't quite understand
bare symbols yet, but it doesn't appear to change anything if I check

(let ((i 0))
  (mapatoms (lambda (s)
    (when (bare-symbol-p s)
      (setq i (1+ i))))
    obarray)
  (list (length obarray) i))

I am confused.  All I want is a max value for a progress reporter :(

In GNU Emacs 29.0.50 (build 14, x86_64-pc-linux-gnu, GTK+ Version
 3.24.34, cairo version 1.17.6) of 2022-10-06 built on rhea
Repository revision: 2c4c72b45d833b6ccdd2cc06ca3c6c9e9ad54357
Repository branch: feature/package+vc
System Description: Fedora Linux 36 (Workstation Edition)

Configured using:
 'configure --with-pgtk --with-imagemagick'

Configured features:
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JPEG JSON LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER
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