[Rails] controller failing to read flash

I'm seeing some pretty strange behavior from the flash in my rails
2.3.8 app. I set the flash in a request, and then redirect. In the
next request (the one redirected to), accessing the flash returns an
empty hash, but the flash is stored and visible in the session.

(rdb:21) session
{:user_credentials=>"...", :session_id=>"...", :user_credentials_id=>1, :flash=>{:notice=>"Twitter
status updated"}, :_csrf_token=>"..."}
(rdb:21) session[:flash]
{:notice=>"Twitter status updated"}
(rdb:21) flash
{}

Looking at the source for flash in actionpack-2.3.8/lib/
action_controller/flash.rb,
the difference is that the key is stored as a string and not a symbol.
How could that disparity occur?

# Access the contents of the flash. Use <tt>flash["notice"]</tt> to
# read a notice you put there or <tt>flash["notice"] =
"hello"</tt>
# to put a new one.
def flash #:doc:
if !defined?(@_flash)
@_flash = session["flash"] || FlashHash.new
@_flash.sweep
end

@_flash
end

Thanks!

Andrew

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