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I had the same question and ended up figuring it out by reading the multi_index.hpp from eosio.cdt code and wanted to share my solution.

Instead of using auto, declare the type by using myindex::const_iterator:

struct [[eosio::table]] _obj {
    name key;
    uint64_t primary_key() const { return key.value; }
};

typedef eosio::multi_index<name("myindex"), _obj> myindex;

void do_biz_stuff(myindex::const_iterator& o) { ... }

Additional Note

If you want to use modify, erase, or iterator_to inside do_biz_stuff you must be sure to pass the iterator by reference and also to pass the multi_index instance by reference. Otherwise you'll receive the errors like object passed to modify / erase / iterator_to is not in multi_index or copy constructor of 'item_ptr' is implicitly deleted because field '_item' has a deleted copy constructor

void do_biz_stuff(myindex& idx, myindex::const_iterator& itr) {
    idx.erase(itr);
}