r observe is called.
Also, differently form the Signal case, it can be called with the same value twice in succession.</p><h4> Additional information </h4><p>Besides future compositon methods like <a href="ReactiveLibraryUsage$FutureExtensions2.html#executeFuture(defaultVal:A)(implicitec:scala.concurrent.ExecutionContext):ReactiveLibraryUsage.this.Signal[A]" class="extmbr" name="react.core.ReactiveLibraryUsage.FutureExtensions2#executeFuture">react.core.ReactiveLibraryUsage#FutureExtensions2#executeFuture</