basic

type Config struct {
	Host    string `cfg:"host"     default:"localhost"`
	Port    int    `cfg:"port"     default:"8080"`
	PortPtr *int   `cfg:"port_ptr" default:"8080"`

	Duration    time.Duration  `cfg:"duration"     default:"1s"`
	DurationPtr *time.Duration `cfg:"duration_ptr" default:"2s"`

	// Database configuration
	DB struct {
		Pass string `cfg:"pass"` // DB_PASS environment variable
	}

	Fn      func()     // cannot be loaded, result is <nil>
	Channel <-chan int // cannot be loaded, result is <nil>
}