Django models: default value for column

I have following Django model code:

status = models.PositiveIntegerField(default = 0b000)
comments_allowed = models.BooleanField(default = True) # whether comments are allowed to this post

But I expected, it would generate SQL like

`status` integer NOT NULL default '4',
`comments_allowed` bool NOT NULL default TRUE

Which is not happening and when I run manage.py sqlall appname it produces:

`status` integer UNSIGNED NOT NULL,
`comments_allowed` bool NOT NULL

Delving into Django's code and googling gave me nothing, but James Bennet's comment that default is not assumed to affect generating SQL, but needed for Django admin. Even if so, how do I get desired effect?

My Django version is 1.3.0 final