All numeric heading identifiers

["andreas....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <andreas.schamanek-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I read the sections Heading Identifiers and Extension: auto_identifiers 
<https://pandoc.org/MANUAL.html#extension-auto_identifiers> in the manual. 
So, I think I understand why the following produces `id="section"`

$ printf '# 47\n' | pandoc
<h1 id="section">47</h1>

But why is it that I cannot make Pandoc use a specific identifier like in

$ printf '# 47 {#47}\n' | pandoc 
<h1 id="section">47 {#47}</h1>

I expected Pandoc to produce `id="47"`.

BTW, I came upon this because I was wondering how to reference ISO dates in 
headers, like

## 2021-08-29

because

## 2021-08-29 {#2021-08-29}

produces `id="section"` too.

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