Migration Generator changes column type

[haslinger]

I see a strange issue here: I added to the user model

erp_account_nr   :string, :index => true
erp_contact_nr   :string

a long time ago.
Suddenly when i run the migration generator (because of a change in another model),
it also wants to change

---------- Up Migration ----------
change_column :users, :erp_contact_nr, :integer, :limit => 4
change_column :users, :erp_account_nr, :integer, :limit => 4

and correspondingly

---------- Down Migration --------
change_column :users, :erp_contact_nr, :string
change_column :users, :erp_account_nr, :string

It's not a shopstopper, I just don't migrate immediately, fix the migration by hand and run it, but I don't get a few things:

• Why does it suggest :limit => 4 , this is so un-Hobo-esque ?
• I don't find any limit setting to 4 in the Hobo code, I looked in the current /hobo/hobo_fields/lib/generators/hobo/migration/*
• I thought, maybe it's the postfix _nr ... so I thought : change the columns to erp_account_nur, but that wouldn't rename, it would retype the old column to integer still and create a new column.

Probably I'm doing something completely wrong here ...