GNU bug report logs - #55334
Incorrect documentation of "string-to-number" function

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: emacs <at> kaction.cc
To: bug-gnu-emacs <at> gnu.org
Subject: Incorrect documentation of "string-to-number" function
Date: Mon, 9 May 2022 02:13:38 -0400

As of commit [364e3d7] (2022-05-09), doc/lispref/strings.texi says
following about "string-to-number" function:
https://git.savannah.gnu.org/cgit/emacs.git/tree/doc/lispref/strings.texi#n851

	@defun string-to-number string &optional base
	@cindex string to number
	This function returns the numeric value of the characters in
	@var{string}.  If @var{base} is non-@code{nil}, it must be an integer
	between 2 and 16 (inclusive), and integers are converted in that base.
	If @var{base} is @code{nil}, then base ten is used.  Floating-point
	conversion only works in base ten; we have not implemented other
	radices for floating-point numbers, because that would be much more
	work and does not seem useful.

	If @var{string} looks like an integer but its value is too large
	to fit into a Lisp integer, @code{string-to-number} returns a
	floating-point result.

Last paragraph does not match behaviour I can observe on my emacs:

	(floatp (string-to-number (number-to-string (expt 2 800))))
	=> nil
	(bignump (string-to-number (number-to-string (expt 2 800))))
	=> t

I think this paragraph was written before advent of bignums, and
should be removed.

Configured using:
 'configure
 --prefix=/nix/store/svyam9iybwcl5g7wrll1sgwhilw33f9k-emacs-27.2
 --disable-build-details --with-modules --with-x-toolkit=gtk3 --with-xft
 --with-cairo'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  paredit-mode: t
  company-mode: t
  shell-dirtrack-mode: t
  evil-mode: t
  evil-local-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/kaction/devel/emacs/emacs-nix-environment/nix-environment hides /home/kaction/.emacs.d/elpa/nix-environment-1.0/nix-environment

Features:
(shadow sort mail-extr emacsbug sendmail apropos jka-compr lisp-mnt
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term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
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make-network-process emacs)

Memory information:
((conses 16 548656 142469)
 (symbols 48 37539 2)
 (strings 32 190251 24393)
 (string-bytes 1 5455638)
 (vectors 16 246978)
 (vector-slots 8 1696599 60880)
 (floats 8 91200 126)
 (intervals 56 1255 78)
 (buffers 1000 18))

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Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.