Stefan Kangas <stefankangas@gmail.com> writes:

> Visuwesh <visuweshm@gmail.com> writes:
>
>> [செவ்வாய் செப்டம்பர் 27, 2022] Stefan Kangas wrote:
>>
>>> Could we change `format-spec' to accept functions in the substitutions,
>>> that are then only called when actually needed?
>>
>> +1. I was thinking of raising such a proposal myself.  It seems wasteful to
>> pre-calculate all the specifications instead of lazily evaluating them.
>
> The change is just the attached, plus documentation.

Nice.

> [2. text/x-diff; 0001-Make-format-spec-support-functions.patch]...

(if (and (functionp res)) (funcall res) res)
    ^^^^^^^^^^^^^^^^^^^^^

-- 
Thierry