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=item 'hints'

=item 'bitmask'

=back

with each of the values for these keys being the equivalent item from
the list returned by C<caller> in list context. This is useful because
it means that, instead of:

    $subname = (caller)[3];

you can write the much more readable:

    $subname = caller->{sub};

=back

=head1 DIAGNOSTICS

None.