Been using it in a personal project of mine for awhile.
Basically, its optional parameters for partial views, to make it a bit more clean.
==View.rhtml==
render :partial => 'post', :locals => { :post => @post}, :opts => { :show_comments => true }
==_post.rhtml==
<% if opts.with_default(:show_comments, false) %>
Yadda yadda
<% end %>
Not much code, but its a simple idiom I found myself repeating (a lot) so I wrapped it up into a plugin.
linkage:
Arron's rails plugins
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