[Rails] why doesn't .where() honor polymorphism?

I love the query interface (ActiveMethod::QueryMethods), but one thing
has bugged me: why doesn't it generate calls for polymorphic
associations? For example:

class MyModel < ActiveRecord::Base
belongs_to :parent, :polymorphic => true
end

I would expect:

MyModel.where(:parent => a)

to be equivalent to:

MyModel.where("my_models.parent_id = ? AND my_models.parent_type = ?",
a.id, a.class.base_class.name)

Is there a philosophical reason it doesn't make this transformation?

- ff

P.S.: After writing this, I realize it's not just for polymorphism. I
would expect the NON-polymorphic case to transform:

MyModel.where(:parent => a)

into

MyModel.where("my_models.parent_id = ?", a.id)

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