my.pl

# Before:

my %thing = ( this => 'that', other => $self->my_method(@args));

sub my_method { ...; return $stuff }

# except it's really easy for me the developer to forget to type the 'other' key
# which results in surprising fails

# So ... wantarray

my $thing = (this => 'that', $self->my_method);
sub my_method { ...; return wantarray ? ( other => $stuff ) : $stuff };

# and no more surprises