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        my ($parent, $child, $param) = @_;
        return $parent->coercion;
    },
    #inline_generator => sub {},
    #deep_explanation => sub {},
);

$meta->add_type(
    name => 'Boolean',
    parent => InstanceOf['JSON::PP::Boolean'],
    constraint_generator => sub {
        return $meta->get_type('Boolean') if !@_;

        return sub {
            return if ! ( blessed $_ and $_->isa('JSON::PP::Boolean') );
            return 1;
        };
    },
    coercion_generator => sub {
        my ($parent, $child, $param) = @_;
        return $parent->coercion;
    },
);

coerce Boolean,
    from Bool,
        via {
            my $new = $_ ? $JSON::PP::true : $JSON::PP::false;
            $new;
        }
;

__PACKAGE__->meta->make_immutable;

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

API::MailboxOrg::Types - Types related to Mailbox.org API

=head1 VERSION

version 1.0.2

=head1 SYNOPSIS

    {
        package  # private package - do not index
            TestClass;

        use Moo;
        use API::MailboxOrg::Types qw(Boolean HashRefRestricted);

        has true_or_false => ( is => 'ro', isa => Boolean, coerce => 1 );
        has map           => ( is => 'ro', isa => HashRefRestricted[qw(a b)] ); # allow only keys a and b

        1;
    }

    my $obj = TestClass->new(
        true_or_false => 1,  # 0|1|""|undef|JSON::PP::Boolean object
        map  => {
            a => 1,
            b => 1,
            # a key 'c' would cause a 'die'
        },
    );

=head1 TYPES

=head2 HashRefRestricted[`a]

This expects a hash reference. You can restrict the allowed keys

=head2 Boolean

A JSON::PP::Boolean object.

=head1 COERCIONS

These coercions are defined.

=head2 To Boolean

=over 4

=item * String/Integer to boolean

The values "" (empty string), I<undef>, 0, and 1 are coerced to C<JSON::PP::Boolean> objects.

=back

=head1 AUTHOR

Renee Baecker <reneeb@cpan.org>

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2022 by Renee Baecker.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

=cut