CombineLatest.swift

import Combine
import Foundation

let c = Publishers
    .CombineLatest(
        Just(true)
            .delay(for: .seconds(0.5), scheduler: DispatchQueue(label: "A"))
            .prepend(false),
        Just(true)
            .delay(for: .seconds(1), scheduler: DispatchQueue(label: "B"))
            .prepend(false)
    )
    .print()
    .dropFirst()
    .sink { _ in
        sleep(1) // Simulating some heavy computation, making "B" emit while "A" is still being processed
    }

// Expecting a sequence of (false, false), (true, false), (true, true), finished
// Getting a sequence of (false, false), (true, false), finished 😱