wip: Add relaxed message

src/cell/slice.rs

@@ -8,6 +8,8 @@ use crate::cell::{
 use crate::error::Error;
 use crate::util::{unlikely, Bitstring};
 
+use super::CellFamily;
+
 /// A data structure that can be deserialized from cells.
 pub trait Load<'a>: Sized {
     /// Tries to load itself from a cell slice.
@@ -323,6 +325,14 @@ pub struct CellSlice<'a> {
     range: CellSliceRange,
 }
 
+impl Default for CellSlice<'_> {
+    #[inline]
+    fn default() -> Self {
+        // SAFETY: empty cell is an ordinary cell
+        unsafe { Cell::empty_cell_ref().as_slice_unchecked() }
+    }
+}
+
 impl<'a> AsRef<CellSlice<'a>> for CellSlice<'a> {
     #[inline]
     fn as_ref(&self) -> &CellSlice<'a> {