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Subject: Re: Identifying sources of allocations in a toy Mandelbrot package
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 (message from Psionic K on Wed, 17 Jan 2024 21:39:04 +0900)
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> From: Psionic K <psionik@positron.solutions>
> Date: Wed, 17 Jan 2024 21:39:04 +0900
> 
> I want to also remark that `gc-cons-percentage' does not seem to be a
> percentage but a factor.

Yes.  As its doc string says:

  Portion of the heap used for allocation.

"Portion", not "percent".  (The name of the variable is perhaps
unfortunate, but that ship sailed so long ago that we don't even know
where it is by now, probably beyond the termination shock.

>                            (cl-psetq
>                             zr (+ (* zr zr) (- (* zi zi)) cx)
>                             zi (+ (* (* zr zi) 2) cy))))))

cl-psetq conses.