What is '@used' in session file for flash?

When I don’t turn sessions off, I get a ton of files that either
contain:

" hash{"
flashIC:'ActionController::Flash::FlashHash{:
@used{

or:

" hash{

This leads to think that they’re not being used for anything (since
they’re empty, and if flash is
used, its session file contains its value). How can I prevent these
empty session files from being
created in the first place (and still have flash work)?

thanks
csn


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