state

type Memo = immap.ImmutableMap[any]

type MemoTyped[T any] = immap.ImmutableMap[T]

type MutableValue interface {
	Value
	Set(value any)
}

type PersistentState interface {
	GetState(key string, initial func() any) MutableValue
	SetOnStateChange(callback func())
}

type SupportState interface {
	Remember(key string, calc func() any) any          // transient state
	State(key string, initial func() any) MutableValue // persistent state
}

type TypedMutableValue[T any] interface {
	TypedValue[T]
	Set(value T)

	Unwrap() MutableValue
}

type TypedValue[T any] interface {
	Get() T
}

type Value interface {
	Get() any
}