=head1 DESCRIPTION

This module implements Dancer 2 session engine based on L<Sereal> files.

This backend can be used in single-machine production environments, but two
things should be kept in mind: The content of the session files is not
encrypted or protected in anyway and old session files should be purged by a
CRON job.

=head1 CONFIGURATION

The setting B<session> should be set to C<Sereal> in order to use this session
engine in a Dancer2 application.

Files will be stored to the value of the setting C<session_dir>, whose default
value is C<appdir/sessions>.

Arguments for the L<Sereal::Encoder> and L<Sereal::Decoder> objects can be
given via the C<encoder_args> and C<decoder_args>. If not provided, they default to
C<< snappy => 1, croak_on_bless =>1 >> and C<< refuse_objects => 1, validate_utf8 => 1 >>, respectively.

Here is an example configuration that use this session engine and stores session
files in /tmp/dancer-sessions

   session: "Sereal"

   engines:
     session:
       Sereal:
         session_dir: "/tmp/dancer-sessions"
         encoder_args:
           snappy:         1
           croak_on_bless: 1
         decoder_args:
           refuse_objects: 1
           validate_utf8:  1

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