adding SliceMeta

src/ext/slice.rs

@@ -18,6 +18,7 @@ pub enum AnySlice { }
 ///
 /// # Layout
 /// This type has a `repr(C)` memory layout of 2 `size_t`s and is safe for FFI use.
+//TODO: Manyally force impls of all these regardless of if `T` impls them (derive does not do this)
 #[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Copy, Default)]
 #[repr(C)]
 pub struct SliceMeta<T = AnySlice>