hybrid-array: change Deref::Target to [T] (#913)

This makes porting existing `generic-array` code easier, and also means
deref coercion will allow `&Array<T, _>` to deref to `&[T]`, making it
usable anywhere a slice is.

hybrid-array/src/lib.rs

@@ -183,19 +183,21 @@ impl<T, U> Deref for Array<T, U>
 where
     U: ArraySize,
 {
-    type Target = U::ArrayType<T>;
+    type Target = [T];
 
-    fn deref(&self) -> &U::ArrayType<T> {
-        &self.0
+    #[inline]
+    fn deref(&self) -> &[T] {
+        self.0.as_ref()
     }
 }
 
 impl<T, U> DerefMut for Array<T, U>
 where
     U: ArraySize,
 {
-    fn deref_mut(&mut self) -> &mut U::ArrayType<T> {
-        &mut self.0
+    #[inline]
+    fn deref_mut(&mut self) -> &mut [T] {
+        self.0.as_mut()
     }
 }
 
@@ -320,8 +322,6 @@ pub trait ArrayOps<T, const N: usize>:
     + AsMut<[T; N]>
     + Borrow<[T; N]>
     + BorrowMut<[T; N]>
-    + Deref<Target = [T; N]>
-    + DerefMut
     + From<[T; N]>
     + Index<usize>
     + Index<Range<usize>>