🐛 :: Append closure to observers before executing

[dudek-j]

When subscribing to a Variable<T> the initial value triggers the provided closure. If the closure makes changes to the underlying value of the same Variable<T> the closure does not re-trigger on its first run.

Sample Code Showcasing Issue

enum ExampleEnum {
    case initialValue
    case secondaryValue
}

let exampleVariable = Variable<ExampleEnum>(.initialValue)

let disposable = exampleVariable.subscribe({ new, old in
    if new == .initialValue {
        print("InitialValue")
        exampleVariable.value = .secondaryValue
    }
    if new == .secondaryValue {
        print("SecondaryValue")
    }
})

Expected Output
InitialValue
SecondaryValue

Actual Output
InitialValue

Solution
The proposed changes make it so the closure is added to the observer list before it's executed for the first time

[fxm90]

Great fix, thank you 👍