bug#26910: 26.0.50; Enhancement request: type-checking in customize-set-variable

[N. Raghavendra]

I would like a way to set options using Emacs Lisp directly (without
interacting with customization buffers), which ensures that the :set and
:type specifications of the options are respected.  Evaluating

(customize-set-variable OPTION VALUE)

uses the :set property of OPTION, but doesn't check that VALUE has the
type specified in the

(defcustom OPTION ...)

expression.

I request the addition of an optional argument to customize-set-variable,
so that, e.g.,

(customize-set-variable OPTION VALUE "This is a comment." t)

generates an error if VALUE is not of the type specified by

(defcustom OPTION ...),

and otherwise does everything that

(customize-set-variable OPTION VALUE "This is a comment.")

does now.  I also request a similar addition to `custom-set-variables'.

----------------------------------------------------------------------

In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2017-01-22 built on ailuros
Repository revision: 0a49f158f1598fb92989f3cbdc238a7e5f1bd8a3
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:     Linux Mint 18.1 Serena

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chinese composite charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 567283 26624)
 (symbols 48 51192 2)
 (miscs 40 131 303)
 (strings 32 133090 16113)
 (string-bytes 1 4369195)
 (vectors 16 76644)
 (vector-slots 8 1110642 10975)
 (floats 8 728 400)
 (intervals 56 923 8)
 (buffers 976 25)
 (heap 1024 71343 2610))

-- 
N. Raghavendra <raghu@hri.res.in>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/