Function is_number

Source/external/json.hpp:20494–20497

@brief return whether value is a number @sa https://json.nlohmann.me/api/basic_json/is_number/

	/// @brief return whether value is a number
	/// @sa https://json.nlohmann.me/api/basic_json/is_number/
	constexpr bool is_number() const noexcept
	{
		return is_number_integer() || is_number_float();
	}

	/// @brief return whether value is an integer number
	/// @sa https://json.nlohmann.me/api/basic_json/is_number_integer/