Wrong FK naming

[e1senh0rn]

I found strange behavior, more likely to be a bug for me.
Steps to reproduce:
DBMS: MySQL 5.1.45

Create table with field supposed to be FK:

create_table :seals do |t|
  t.references :bag, :foreign_key => {:dependent => :delete}, :null => false
  ...
end

Constraint named "seals_ibfk_1" will be created.

And when I run

remove_foreign_key  :seals, :bags

SQL query with drop FK name "fk_seals_bag_id" would be generated.