Override read_exact and write_all

Some types override these methods to provide optimizations. Using
default implementations would bypass those overrides and lead to worse
performance.

Overriding the methods to delegate implementations directly solves the
problem.

src/lib.rs

@@ -1051,6 +1051,10 @@ where
         for_both!(*self, ref mut inner => inner.read(buf))
     }
 
+    fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
+        for_both!(*self, ref mut inner => inner.read_exact(buf))
+    }
+
     fn read_to_end(&mut self, buf: &mut std::vec::Vec<u8>) -> io::Result<usize> {
         for_both!(*self, ref mut inner => inner.read_to_end(buf))
     }
@@ -1099,6 +1103,10 @@ where
         for_both!(*self, ref mut inner => inner.write(buf))
     }
 
+    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+        for_both!(*self, ref mut inner => inner.write_all(buf))
+    }
+
     fn flush(&mut self) -> io::Result<()> {
         for_both!(*self, ref mut inner => inner.flush())
     }