std::variant and JS null about quickjspp HOT 2 OPEN

I think std::monostate is more similar to js undefined (because js variables are undefined when not initialized). For js null std::nullptr_t might be good choice.

For variant support, yes, you currently need to modify quickjspp.hpp to add new types

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Just a quick comment to mention that std::variant default-constructs to its first type's default value.
Thus I think typically, std::monostate (or std::nullptr_t) should be your first rather than last type.
And @ftk , very good point about undefined ~= std::monostate and null ~= std::nullptr_t.

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