fix panic on large lists

simdnbt/src/borrow/compound.rs

@@ -340,9 +340,7 @@ impl ParsingStack {
         unsafe {
             self.stack
                 .get_unchecked_mut(self.depth - 1)
-                .as_mut_ptr()
-                .as_mut()
-                .unwrap_unchecked()
+                .assume_init_mut()
         }
     }
 }

simdnbt/src/borrow/tape.rs

@@ -142,6 +142,7 @@ impl TapeElement {
     }
 
     pub fn new_with_approx_len_and_offset(kind: TapeTagKind, approx_len: u32, offset: u32) -> Self {
+        let approx_len = approx_len.min(0xff_ffff);
         debug_assert!(approx_len < 2u32.pow(24));
         Self(((kind as u64) << 56) | ((approx_len as u64) << 32) | (offset as u64))
     }