Hey Claude, thanks for this. 

This seems like a win to me... a nice clean-up. 

I have to say, I never once set `USE_L10N = False` — I don't imagine many
people do, but my only concern would be whole swaths of folks that depend on
this… — do such exist in numbers? 🤔

This comments seemed pertinent: 

> Le dimanche 13 juin 2021 à 01:09:26 UTC+2, re...@....net a écrit :
> > I have run into bugs because template authors forgot to unlocalize 
> > values, in particular database IDs. These bugs often go unnoticed for 
> > quite a while because they only show up once you reach 1000 database 
> > rows. Forgetting to localize a value would typically be a much more 
> > obvious bug. 
> 
> I understand this concern. I wonder if that could be solved separately, 
for example by:
>  - returning int subclasses from AutoField's to_python (a bit like 
str/SafeString for handling escaping)
>  - not localizing those integers, unless use_l10n is forced (True)
> Does this look like a plan (even without touching USE_L10N)?

So we escape HTML by default, because that's the right thing to do. 

Same here, we already localize by default (in reality, because the project 
template has been that way ≈forever), again because it's the right 
behaviour. 

We `unlocalize` where that's not helpful. (But maybe there could be nicer 
API 
there.) 

Here we're just removing a whole load of codepaths for handling a unusual 
use-case. (Again, assuming it's as minority as we think). 

>From the PR: 

> ...if needed, you can simulate the
> old ``USE_L10N = False`` behavior by defining those format settings in 
your
> settings file. 
> - docs/releases/4.0.txt

Maybe we could give an example there (🤔) but there's a fallback. 

So I think +1. 

Kind Regards,

Carlton

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