compileall shouldn't recompile up-to-date files with hash-based invalidation mode

Feature or enhancement

Proposal:

When you compile sources into .pyc files with python -m compileall while using the defaul invalidation mode (timestamp), the script verifies whether the compilation is necessary (the pyc file is up to date) and can skip it:

$> python -m compileall --invalidation-mode=timestamp script.py
Compiling 'script.py'...
$> python -m compileall --invalidation-mode=timestamp script.py
$>   # the compilation is skipped

When either of the hash invalidation modes is used instead, this doesn't work - the hash based check is not there. https://github.com/python/cpython/blob/main/Lib/compileall.py#L229

$> python -m compileall --invalidation-mode=checked-hash script.py
Compiling 'script.py'...
$> python -m compileall --invalidation-mode=checked-hash script.py
Compiling 'script.py'...
$>

I think it would make sense to add the same functionality for the other two invalidation modes as well?

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-121960

Inizia in Lib/compileall.py, nella gestione della modalità di invalidazione intorno alla riga collegata, e riproduci il comportamento con i due comandi python -m compileall mostrati per le modalità checked-hash e unchecked-hash. Il lavoro è completato quando la compilazione ripetuta di un sorgente aggiornato viene ignorata per entrambe le modalità di invalidazione tramite hash, preservando il comportamento esistente dei timestamp.