feat: put len before xs

src/array_string.rs

@@ -31,10 +31,11 @@ use serde::{Serialize, Deserialize, Serializer, Deserializer};
 /// The string is a contiguous value that you can store directly on the stack
 /// if needed.
 #[derive(Copy)]
+#[repr(C)]
 pub struct ArrayString<const CAP: usize> {
     // the `len` first elements of the array are initialized
-    xs: [MaybeUninit<u8>; CAP],
     len: LenUint,
+    xs: [MaybeUninit<u8>; CAP],
 }
 
 impl<const CAP: usize> Default for ArrayString<CAP>

src/arrayvec.rs

@@ -39,10 +39,11 @@ use crate::utils::MakeMaybeUninit;
 ///
 /// It offers a simple API but also dereferences to a slice, so that the full slice API is
 /// available. The ArrayVec can be converted into a by value iterator.
+#[repr(C)]
 pub struct ArrayVec<T, const CAP: usize> {
+    len: LenUint,
     // the `len` first elements of the array are initialized
     xs: [MaybeUninit<T>; CAP],
-    len: LenUint,
 }
 
 impl<T, const CAP: usize> Drop for ArrayVec<T, CAP> {