optional third argument for has_many

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the docs mention an optional third argument for the has_many method
(when you don't want to setup a circular relationship in your foreign
class with a has_a), but I can't seem to find an example of the
syntax...

I've seen other code posted on this list looking like this
__PACKAGE__->has_many(col_id=>'PACKAGE::NAME'=>other_col);  

I just don't understand how that is supposed to work ( lack of obtuse
perl knowledge is to blame? lack of obtuse perl knowledge is lame :)
can  that call also just be:
__PACKAGE__->has_many(col_id=>'PACK::NAME', 'other_col') ?

-thanks