Many thanks John, I’ve just posted it there.

Tim

> On 3 Feb 2022, at 23:17, 'John Clements' via Racket Users 
> <racket-users@googlegroups.com> wrote:
> 
> Sounds like a good question to me. Perhaps it would make sense to post it to 
> the discourse group, instead? I’m happy to ask on your behalf if you don’t 
> feel like it.
> 
> https://racket.discourse.group/
> 
> John
> 
>> On Feb 3, 2022, at 5:58 AM, Tim Jervis <t...@timjervis.com> wrote:
>> 
>> Dear Racketeers,
>> 
>> Is there something I have misunderstood about vectors, boxes and places 
>> which might explain why immutable boxes are not place-message-allowed, but 
>> immutable vectors are?
>> 
>>> (place-message-allowed? (box-immutable #f))
>> #f
>>> (place-message-allowed? (vector-immutable #f))
>> #t
>>> 
>> 
>> c.f.
>> 
>> https://docs.racket-lang.org/reference/boxes.html 
>> 
>> A box is like a single-element vector, normally used as minimal mutable 
>> storage.
>> 
>> Best,
>> 
>> Tim
>> 
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