Currently, there's `std::find` to iterate over the containers to check the
given element is in there or not. C++23 `std::basic_string` and
`std::basic_string_view` comes with handy function, called `contains()` to
check the substring is in there. Why would not the same functionality comes
with `std::vector`, `std::array` or other iterable containers?

Before, we would use that:
`if(std::find(vec.begin(), vec.end(), item) != vec.end()) {}`

With the power of `contains()`, we can use that:
`if(vec.contains(item)) {}`