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

[Gerd Möllmann]

Philip Kaludercic <philipk@posteo.net> writes:

>>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.

obarray is a hash table. with each array element being a list of symbols
if not empty, for hash collisions.  And it's not a hash table of the
kind that make-hash-table makes, which I added much later.  And not a
Lisp list of symbols.

With your figures, it seems that there are on average 5 symbols per
bucket.  For details you'd have to look at the C code.