I agree that *_alter_field *should be refactored, because currently is 
unmaintainable or at least really hard to maintain. I checked and some of 
the official 3rd-party database backends [1] use this private API i.e. 
django-mssql 
[2], django-firebird [3]. Maybe we should take that into account.

[1]: 
https://docs.djangoproject.com/en/1.11/ref/databases/#using-a-3rd-party-database-backend
[2]: 
https://bitbucket.org/Manfre/django-mssql/src/d44721ba17acf95da89f06bd7270dabc1cd33deb/sqlserver_ado/schema.py?at=master&fileviewer=file-view-default#schema.py-152
[3]: 
https://github.com/maxirobaina/django-firebird/blob/master/firebird/schema.py#L112

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