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STI delete_all works fine on 2 layers STI

class P
  include Mongoid::Document
end

class C < P
end

> P.delete_all  #   MOPED: 127.0.0.1:27017 DELETE       database=xxx_development collection=ps selector={} flags=[]

but some problem occurred on 3 layers STI

class GF
  include Mongoid::Document
end

class P < GF
end

class C < P
end

> P.delete_all  #    MOPED: 127.0.0.1:27017 DELETE       database=xxx_development collection=gfs selector={:_type=>"P"} flags=[]

Invoking P.delete_all only delete all documents of type P but I would like to delete all documents of type P and C
Is this issue by design or bug ?