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=encoding utf8

=head1 NAME

Clownfish::Boolean - Boolean type.

=head1 SYNOPSIS

    use Clownfish::Boolean qw( $true_singleton $false_singleton );

    my $bool = Clownfish::Boolean->singleton($truth_value);
    my $truth_value = $bool->get_value;

    if ($bool->equals($true_singleton)) {
        print "true\n";
    }

=head1 DESCRIPTION

There are only two singleton instances of this class: C<$true_singleton> and
C<$false_singleton> which are exported on demand.

=head1 CONSTRUCTORS

=head2 singleton

    my $bool = Clownfish::Boolean->singleton($truth_value);

Return either C<$true_singleton> or C<$false_singleton> depending on the
supplied value.

=head1 METHODS

=head2 get_value

    my $bool = $boolean->get_value();

Return the value of the Boolean.

=head2 clone

    my $result = $boolean->clone();

Return a clone of the object.

=head1 INHERITANCE

Clownfish::Boolean isa L<Clownfish::Obj>.

=cut