Since `Set` was transitioned to a C-level core class in Ruby 4.0, several operations that allocate new sets or partition subsets (`&`, `^`, `collect!`, `flatten`, `classify`, and `divide`) lost the `compare_by_identity` behavior for the ...gil.desmarais (Gil Desmarais)
gil.desmarais (Gil Desmarais)04:31 PM Ruby Bug #22174 (Open): Set operations (&, ^, collect!, flatten, classify, divide) do not preserve compare_by_identity