make it not unsafe

src/encoding.rs

@@ -206,7 +206,7 @@ impl<'a> PackedTradeData<'a> {
     }
 
     #[inline]
-    pub unsafe fn meta_i32(&self) -> i32 {
+    pub fn meta_i32(&self) -> i32 {
         i32::from_le_bytes((&self.0[..4]).try_into().unwrap())
     }