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set_callback read => \&_read_callback;

=back

=cut

=head1 DIAGNOSTICS

Most error communication is done through give-up codes.
However, some conditions aren't worth of keeping process alive -- those are
marked as B<(fatal)>.
Others are (mostly) in just B<fork>ed process that just couldn't boot
properly -- those are communicated back (somehow).

=over

=item (%s): candiate to pass is neither CODE nor (undef)

B<(fatal)>
In L</set_callback()>.