simplify the readable and writable traits a bit

packages/signals/src/signal.rs

@@ -1,6 +1,6 @@
 use crate::{
     read::Readable, write::Writable, Effect, EffectInner, GlobalMemo, GlobalSignal, MappedSignal,
-    ReadOnlySignal, ReadableRef, WritableRef,
+    ReadOnlySignal,
 };
 use std::{
     any::Any,
@@ -399,7 +399,7 @@ impl<T: 'static, S: Storage<SignalData<T>>> Signal<T, S> {
     }
 }
 
-impl<T, S: Storage<SignalData<T>>> ReadableRef for Signal<T, S> {
+impl<T, S: Storage<SignalData<T>>> Readable<T> for Signal<T, S> {
     type Ref<R: ?Sized + 'static> = S::Ref<R>;
 
     fn map_ref<I, U: ?Sized, F: FnOnce(&I) -> &U>(ref_: Self::Ref<I>, f: F) -> Self::Ref<U> {
@@ -412,9 +412,7 @@ impl<T, S: Storage<SignalData<T>>> ReadableRef for Signal<T, S> {
     ) -> Option<Self::Ref<U>> {
         S::try_map(ref_, f)
     }
-}
 
-impl<T, S: Storage<SignalData<T>>> Readable<T> for Signal<T, S> {
     /// Get the current value of the signal. This will subscribe the current scope to the signal.  If you would like to read the signal without subscribing to it, you can use [`Self::peek`] instead.
     ///
     /// If the signal has been dropped, this will panic.
@@ -458,7 +456,7 @@ impl<T, S: Storage<SignalData<T>>> Readable<T> for Signal<T, S> {
     }
 }
 
-impl<T: 'static, S: Storage<SignalData<T>>> WritableRef for Signal<T, S> {
+impl<T: 'static, S: Storage<SignalData<T>>> Writable<T> for Signal<T, S> {
     type Mut<R: ?Sized + 'static> = Write<R, S>;
 
     fn map_mut<I, U: ?Sized + 'static, F: FnOnce(&mut I) -> &mut U>(
@@ -474,9 +472,7 @@ impl<T: 'static, S: Storage<SignalData<T>>> WritableRef for Signal<T, S> {
     ) -> Option<Self::Mut<U>> {
         Write::filter_map(ref_, f)
     }
-}
 
-impl<T: 'static, S: Storage<SignalData<T>>> Writable<T> for Signal<T, S> {
     #[track_caller]
     fn try_write(&self) -> Result<Self::Mut<T>, generational_box::BorrowMutError> {
         self.inner.try_write().map(|inner| {