bug#46761: 28.0.50; Speed up json.el encoding

[Dmitry Gutov]

On 27.02.2021 21:30, Basil L. Contovounesios wrote:
> > but I can't think of a use case where this would matter.
> Agreed, because by the time a single with-temp-buffer becomes the
> limiting factor, the encoding time for such small objects is trivially
> small.

I suppose someone somewhere could be encoding lots of small objects in a 
loop. That will likely become slower.

But we can install the patch and then wait for someone to report such 
problem.