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Subject: Re: How to read an integer from the minibuffer
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>> The fourth argument is new in Emacs 29, indeed.
>
> GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, cairo version 1.16.0) 
> of 2021-10-04
>

It was added on 2021-10-07 ;-)

>> Apparently it doesn't do what I want here, namely converting "[0-9]" 
>> into "0123456789", "[0-9a-f]" into "0123456789abcdef", and so forth.
>
> I think it can!
>

Please show me how...