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The following options may eventually be added to C<init> if there is
demand:
=over 4
=item digest_module
Which digest module to use to create the checksum portion of the session
key. By default this is C<Digest::MD5>, but you could use any other
module with the same interface, such as C<Digest::SHA1>.
=item keyname_generator
Normally the form state is stored in the user's session
session using a key like:
form_state_storage_name_84eb13cfed01764d9c401219faa56d53
If you want to name keys differently, you can provide a subroutine to
generate the name. The subroutine is passed the name of the form state
storage.
=back
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