Update permissions on custom permissions migration

[Yo-Yo Ma]

A model with a custom permission:

class Spam(Model):
    class Meta:
        permissions = (('spam', 'Can eat spam'),)

...

    $ manage.py makemigrations
    $ manage.py migrate

Now we have a custom permission in the User admin:

    foods | spam | Can eat spam

Then update the permission's verbose name:

class Spam(Model):
    class Meta:
        permissions = (('spam', 'Can cook AND eat spam'),)

...

    $ manage.py makemigrations
    $ manage.py migrate

The permission's description change is not reflected in the admin:

    foods | spam | Can eat spam

[Yo-Yo Ma]

FWIF, I wrote a custom data migration to update the Permission model.

My OP is attempting to suggest that migrations should handle this automatically.