Rails - Jul 2012 - select and collection_select :include_blank option doing different things in rails 3.2.6

Not sure if this is intended, but this threw me off a bit especially being 
new to Rails. This applies to both select_tag and select (when tied to an 
object)

=select_tag(''test'', options_for_select((1..3).to_a),
:include_blank =>
"test")
yields this:

<option value=""></option>

 
=select_tag(''test'', options_for_select((1..3).to_a), :prompt
=> "test")
gives this

<option value="">test</option>

A collection_select however, will give the same result whether it''s 
:include_blank or :prompt
=collection_select(:car, :make, Make.all, :id, :name, {:include_blank =>
''-
Make -''}) 

<option value="">- Make -</option>

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