bug#70077: An easier way to track buffer changes

[Andrea Corallo <acorallo@gnu.org>]

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

>>> Maybe `describe-type` should lists the slots first and the docstring
>>> underneath rather than other way around?
>>
>> That'd also be good.  Then the doc string should say something like
>>
>>   Object holding a description of a buffer state.
>>   It has the following Allocated Slots:
>>
>>             Name    Type    Default
>>             ————    ————    ———————
>>             beg     t       (point-max)
>>             end     t       (point-min)
>>             before  t       nil
>>             next    t       nil
>>
>>   BEG..END is the area that was changed and BEFORE is its previous
>>   content[...]
>
> OK, I'll switch the two, thanks.
>
>> (Btw, those "t" under "Type" are also somewhat mysterious.  What do
>> they signify?)
>
> `C-h o t RET` says:
>
>     t’s value is t
>     
>     Not documented as a variable.
>     
>       Probably introduced at or before Emacs version 16.
>     
>     
>     
>     t is also a type.
>     
>     t is a type (of kind ‘built-in-class’).
>      Children ‘sequence’, ‘atom’.
>     
>     Abstract supertype of everything.
>     
>     This is a built-in type.
>     
>     [back]
>
> We could put buttons in the "Type" column, but I'm not sure it'd be
> better or worse (I'm worried about turning everything into a button).

FWIW I'd vote for buttonify every type in our *Help* buffer.

  Andrea