andidates = [
'JSON::PP::Boolean',
'boolean',
'JSON::XS::Boolean',
'Types::Serialiser::Boolean', # should not be needed
'Mojo::JSON::_Bool', # o
rk.
=item *
L<JSON::PP::Boolean>
=item *
L<boolean>
=item *
L<JSON::XS::Boolean>
=item *
L<Types::Serialiaser::Boolean> (although it should not be needed)
=item *
L<Mojo::JSON::_Bool>, for L
<Mojolicious> up to version 6.21 (it later
switched to L<JSON::PP::Boolean>).
=back
=head2 Unsupported References
When a reference that is neither a hash nor an array reference is found,
method L<