Eric Snow <ericsnowcurren...@gmail.com> added the comment:

On Mon, Aug 30, 2021 at 2:22 PM Guido van Rossum <rep...@bugs.python.org> wrote:
> I propose to only opt in by default in **PGO builds**. After all what we're 
> doing is another extreme optimization.
>
> It should always be possible to opt in using some -X flag (e.g. to debug the 
> freeze import loader) and it should also always be possible to opt *out* (for 
> those cases where you want to edit an installed stdlib module in-place in 
> anger).
>
> I don't know how the -X mechanism works exactly but probably we could make 
> the spelling
>
>   python -X freeze=on|off
>
> with a dynamic default.

+1 to all that

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<https://bugs.python.org/issue45020>
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