Function is_number_integer

Source/external/json.hpp:20501–20504

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

	/// @brief return whether value is an integer number
	/// @sa https://json.nlohmann.me/api/basic_json/is_number_integer/
	constexpr bool is_number_integer() const noexcept
	{
		return m_type == value_t::number_integer || m_type == value_t::number_unsigned;
	}

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