fix Option<String> in props

packages/signals/src/lib.rs

@@ -39,3 +39,6 @@ pub use read::*;
 
 mod write;
 pub use write::*;
+
+mod props;
+pub use props::*;

packages/signals/src/props.rs

@@ -0,0 +1,28 @@
+use crate::Signal;
+use dioxus_core::prelude::*;
+
+#[doc(hidden)]
+pub struct SignalFromMarker<M>(std::marker::PhantomData<M>);
+
+impl<T, O, M> SuperFrom<T, SignalFromMarker<M>> for Signal<O>
+where
+    O: SuperFrom<T, M>,
+{
+    fn super_from(input: T) -> Self {
+        Signal::new(O::super_from(input))
+    }
+}
+
+#[test]
+#[allow(unused)]
+fn into_signal_compiles() {
+    fn takes_signal_string<M>(_: impl SuperInto<Signal<String>, M>) {}
+
+    fn takes_option_signal_string<M>(_: impl SuperInto<Signal<Option<String>>, M>) {}
+
+    fn don_t_run() {
+        takes_signal_string("hello world");
+        takes_signal_string(Signal::new(String::from("hello world")));
+        takes_option_signal_string("hello world");
+    }
+}