Version 1: New API

[MaximBazarov]

Public API revamp, provide a way of multiple wrappers be stacked.

@ObservableValue
@RemoteValue(.backend(.getUserName))
@Persistent(.secure("com.user.name"))
var str = "str-default"

Also changing the mutability:

@SwiftUIBind(
    \Storage.$str,
     mutate: UpdateStr.self
) var str

So @Mutable wrapper is removed, instead, decisions are the only way to mutate the state.

UpdateStr is a special type of decision, that takes a newValue as a parameter:

struct UpdateStr: ValueDecision {
    var newValue: String

    func mutate(_ env: Decide.DecisionEnvironment) {
        env[\.Storage.$str] = newValue
    }
}

this way the mutability is expressed explicitly and gives ability to combine other decisions and side effects on value updates.

Verbosity: right now this version requires quite a sophisticated code to be written, e.g. SwiftUIBind, later the plan is to utilise swift macros to write this code for the user.