multidict

type IfaceToIface interface {
	Len() int
	Put(key, value interface{})
	Discard(key, value interface{})
	Contains(key, value interface{}) bool
	ContainsKey(key interface{}) bool
	IterKeys(f func(key interface{}))
	Iter(key interface{}, f func(value interface{}))
}

type IfaceToString interface {
	Put(key interface{}, value string)
	Discard(key interface{}, value string)
	Contains(key interface{}, value string) bool
	ContainsKey(key interface{}) bool
	Iter(key interface{}, f func(value string))
	Empty() bool
}

type StringToIface interface {
	Len() int
	Put(key string, value interface{})
	Discard(key string, value interface{})
	DiscardKey(key string)
	Contains(key string, value interface{}) bool
	ContainsKey(key string) bool
	Iter(key string, f func(value interface{}))
	IterKeys(f func(key string))
}

type StringToString interface {
	Put(key, value string)
	Discard(key, value string)
	DiscardKey(key string)
	Contains(key, value string) bool
	ContainsKey(key string) bool
	Iter(key string, f func(value string))
}