Method insert_or_update

src/fl/stl/unordered_map_small.h:425–433

    }

    fl::pair<iterator, bool> insert_or_update(const Key& key, const Value& value) FL_NOEXCEPT {
        size_type idx = find_index(key);
        if (idx != npos()) {
            mData[idx].second = value;
            return fl::pair<iterator, bool>(iterator(this, idx), false);
        }
        idx = do_insert(value_type(key, value));
        return fl::pair<iterator, bool>(iterator(this, idx), true);
    }

    bool update(const Key& key, const Value& value) FL_NOEXCEPT {
        size_type idx = find_index(key);