I have an app that uses some custom model fields. These are subclasses of 
standard fields.

I have tried to include as many defaults as possible in custom field to 
stick to DRY.

I have written South introspection rules for these that work fine when I 
change a model

What happens when I change the custom field itself?

For example, if I have a subclass of CharField with a default max_length, 
and I change the
default max_length in the custom field? What if I decide I want no
max_length and decide to subclass TextField instead?

South cannot see the change and running schemamigration --auto gives 
"nothing seems to have changed"

Is there some way to create a migration easily, or would it require 
creating a migration manually?

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