config

type Config interface {

	/*
		1. filter config item which start with prefix
		2. config item would be cutted out prefix
	*/
	WithoutPrefix(prefix string) Config

	/*
		1. filter config item which start with prefix (same to WithoutPrefix)
		2. config item would be retained prefix
	*/
	WithPrefix(prefix string) Config

	/*
	   get and return config value and exists or not
	*/
	Get(string) (any, bool)

	/*
	   get and return config int value if exists, but default if not
	*/
	GetInt(string, int) int

	/*
	   get and return config int64 value if exists, but default if not
	*/
	GetInt64(string, int64) int64

	/*
	   get and return config bool value if exists, but default if not
	*/
	GetBool(string, bool) bool

	/*
	   get and return config string value if exists, but default if not
	*/
	GetString(string, string) string
}