SignalSource
trait Signal[A]
trait WritableSignal[A]
class CustomSignalSource[A]
class DebuggerSignal[A]
class SwitchSignal[A]
class ObservedSignal[A]
class SignalFromEventStream[A]
class Val[A]
class FutureSignal[A]
trait StrictSignal[A]
trait OwnedSignal[A]
trait Var[A]
class SourceVar[A]