Add into_vnode temporary logic for more things

This commit adjusts how rsx! works, making it more forgiving with signals.

Notably, we add the temporaries to if chains too.

examples/signals.rs

@@ -8,8 +8,10 @@ fn main() {
 fn app(cx: Scope) -> Element {
     let running = dioxus_signals::use_signal(cx, || true);
     let mut count = dioxus_signals::use_signal(cx, || 0);
-    let saved_values = dioxus_signals::use_signal(cx, || vec![0]);
+    let saved_values = dioxus_signals::use_signal(cx, || vec![0.to_string()]);
 
+    // Signals can be used in async functions without an explicit clone since they're 'static and Copy
+    // Signals are backed by a runtime that is designed to deeply integrate with Dioxus apps
     use_future!(cx, || async move {
         loop {
             if running.value() {
@@ -24,7 +26,7 @@ fn app(cx: Scope) -> Element {
         button { onclick: move |_| count += 1, "Up high!" }
         button { onclick: move |_| count -= 1, "Down low!" }
         button { onclick: move |_| running.toggle(), "Toggle counter" }
-        button { onclick: move |_| saved_values.push(count.value()), "Save this value" }
+        button { onclick: move |_| saved_values.push(count.value().to_string()), "Save this value" }
 
         // We can do boolean operations on the current signal value
         if count.value() > 5 {
@@ -35,5 +37,12 @@ fn app(cx: Scope) -> Element {
         for value in saved_values.read().iter() {
             h3 { "Saved value: {value}" }
         }
+
+        // We can also use the signal value as a slice
+        if let &[ref first, ..,  ref last] = saved_values.read().as_slice() {
+            rsx! { li { "single element: {first}, {last}" } }
+        } else {
+            rsx! { "No saved values" }
+        }
     })
 }