add Borrow implementation to make it easier to abstract over T and Guard<T>

reactive_graph/src/signal/guards.rs

@@ -2,6 +2,7 @@ use crate::traits::Trigger;
 use core::fmt::Debug;
 use guardian::ArcRwLockReadGuardian;
 use std::{
+    borrow::Borrow,
     fmt::Display,
     marker::PhantomData,
     ops::{Deref, DerefMut},
@@ -34,6 +35,15 @@ where
     }
 }
 
+impl<T, Inner> Borrow<T> for ReadGuard<T, Inner>
+where
+    Inner: Deref<Target = T>,
+{
+    fn borrow(&self) -> &T {
+        self.deref()
+    }
+}
+
 impl<T, Inner> PartialEq<T> for ReadGuard<T, Inner>
 where
     Inner: Deref<Target = T>,