Set/bitset examples should be more complete

[Moz-in-Aus]

With the bitset enum, the example doesn't show how to convert to and from integers and I couldn't find any code online that does this. There's a to_ulong() function but I have no idea what the parameter for that is.

Isn't the whole point of a bitset enum that you can get and set integers? Otherwise it's just a set?

namespace foo { 
    enum class Color { RED = 1, GREEN = 2, BLUE = 4 };
} // namespace -> // is_flags has to be done from global namespace between definition and first use

template <>
struct magic_enum::customize::enum_range<Color> {
    static constexpr bool is_flags = true;
};

namespace foo {
    void main() {
        auto color_bitset = magic_enum::containers::bitset<Color>();
        color_bitset.set(3); 
        std::cout << color_bitset << std::endl;  // RED|GREEN
        int val = color_bitset.to_number(); // 3!
    }
} // namespace

That's my use case and why I looked more into magic_enum. Some embedded thing sends me a byte full of flags and I want to code as though what it meant was flags.test(Flags::SLOW_CLOCK) and reply with flags.set(Flags::FAST_CLOCK)?

More generally, it would be handy if the examples directory covered every public method on the type rather than just the trivial cases.