You can have an intermediate dynamic object that just exports Vec<Foo> specialized functions, and the three consumers that need it just link to that object. If

You can have an intermediate dynamic object that just exports Vec<Foo> specialized functions, and the three consumers that need it just link to that object. If the common need for Vec<Foo> is foreseeable by the dynamic object that provides Foo, it can export the Vec<Foo> functions itself.