Rails - Jan 2010 - best way to set default for an optional local in a partial?

What''s the best way to set the default value of an optional local
variable in a partial template?

In the past I''ve used

  <% foo = default_value unless (defined? foo) %>

But http://api.rubyonrails.org/classes/ActionView/Base.html says *not*
to use (defined? foo) and instead use (local_assigns.has_key? :foo) thus

  <% foo = default_value unless (local_assigns.has_key? :foo) %>

Some have suggested

  <% foo ||= default_value %>

which has the benefit of compact syntax, but will override passed values
of nil and false.  Some have also suggested

  <% foo = default_value if local_assigns[:foo].nil? %>

which will override the passed value nil.

Are there other pros and cons to consider here?  Are any of these
strictly preferred over the others

Thanks!

-Ben
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