Ruby on Rails

So using the magic :cache argument to combine multiple CSS or JS files
into one cached file, using stylesheet_link_tag or
javascript_include_tag respectively...

I sort of figured that if the arguments to the function changed,
including different files.... the combined cached file would be
re-generated.

This does not seem to be the case.

javascript_include_tag "a", "b", :cache => "my_key"

Stop application. Edit the code to be:

javascript_include_tag "a", "b", "c", :cache => "my_key"

Restart the application. Run it. The combined cached my_key.js file
still only includes "a" and "b", the cached file was not invalidated
when I added "c" to it. I had to go and find the file and rm it myself.

Is this a bug? Or is this expected behavior? Is there something I'm
missing? Under what circumstances is the cached file supposed to be
regenerated? If the last-modified timestamp changes on one of the
included files, will it be regenerated? Will it EVER be re-generated?
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