I do not see a reason to disallow empty group_by.
What about passing the whole records to the custom (code reference) agregators for some specially named group_how options? Eg.
...
group_how => {
'&foo' => sub {
my ( $result, $rec) = @_;
return $result + $rec->{a} * $rec->{b}
},
...
producing a new attribute named 'foo' in the resulting records.
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