Extract Vec parts without unstable API

src/parts.rs

@@ -1,3 +1,4 @@
+use std::mem::ManuallyDrop;
 use std::ptr::NonNull;
 
 #[derive(Clone, Copy)]
@@ -8,8 +9,13 @@ pub(super) struct VecParts {
 }
 
 impl VecParts {
-    pub(super) fn from_vec<T>(vec: Vec<T>) -> Self {
-        let (raw_ptr, len, cap) = vec.into_raw_parts();
+    pub(super) fn from_vec<T>(values: Vec<T>) -> Self {
+        // Vec::into_raw_parts is newer than the crate's Rust 1.85 MSRV, so
+        // extract the same fields while ManuallyDrop suppresses Vec::drop.
+        let mut vec_owner = ManuallyDrop::new(values);
+        let raw_ptr = vec_owner.as_mut_ptr();
+        let len = vec_owner.len();
+        let cap = vec_owner.capacity();
 
         // SAFETY: Vec guarantees its underlying pointer is non-null.
         let ptr = unsafe { NonNull::new_unchecked(raw_ptr.cast::<u8>()) };