Fix missing ?Sized bounds for partialeq implementations

Fix #636

Author: sgued

CHANGELOG.md

@@ -6,7 +6,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+
 - Added `from_bytes_truncating_at_nul` to `CString`
+- Fix missing `?Sized` bounds for partialeq implementations 
 
 ## [v0.9.2] 2025-11-12
 

src/deque.rs

@@ -1164,9 +1164,13 @@ where
     }
 }
 
-impl<T: PartialEq, const N: usize> PartialEq for Deque<T, N> {
-    fn eq(&self, other: &Self) -> bool {
-        if self.len() != other.len() {
+impl<T: PartialEq, S1, S2> PartialEq<DequeInner<T, S2>> for DequeInner<T, S1>
+where
+    S1: VecStorage<T> + ?Sized,
+    S2: VecStorage<T> + ?Sized,
+{
+    fn eq(&self, other: &DequeInner<T, S2>) -> bool {
+        if self.storage_len() != other.storage_len() {
             return false;
         }
         let (sa, sb) = self.as_slices();

src/history_buf.rs

@@ -610,11 +610,13 @@ impl<T, const N: usize> Default for HistoryBuf<T, N> {
     }
 }
 
-impl<T, S: HistoryBufStorage<T> + ?Sized> PartialEq for HistoryBufInner<T, S>
+impl<T, S1, S2> PartialEq<HistoryBufInner<T, S2>> for HistoryBufInner<T, S1>
 where
     T: PartialEq,
+    S1: HistoryBufStorage<T> + ?Sized,
+    S2: HistoryBufStorage<T> + ?Sized,
 {
-    fn eq(&self, other: &Self) -> bool {
+    fn eq(&self, other: &HistoryBufInner<T, S2>) -> bool {
         self.oldest_ordered().eq(other.oldest_ordered())
     }
 }

src/vec/mod.rs

@@ -1609,7 +1609,7 @@ impl<A, B, LenTB, const M: usize, SB> PartialEq<VecInner<B, LenTB, SB>> for [A;
 where
     A: PartialEq<B>,
     LenTB: LenType,
-    SB: VecStorage<B>,
+    SB: VecStorage<B> + ?Sized,
 {
     fn eq(&self, other: &VecInner<B, LenTB, SB>) -> bool {
         self.eq(other.as_slice())
@@ -1620,7 +1620,7 @@ impl<A, B, LenTB, SB, const M: usize> PartialEq<VecInner<B, LenTB, SB>> for &[A;
 where
     A: PartialEq<B>,
     LenTB: LenType,
-    SB: VecStorage<B>,
+    SB: VecStorage<B> + ?Sized,
 {
     fn eq(&self, other: &VecInner<B, LenTB, SB>) -> bool {
         (*self).eq(other)
@@ -1631,7 +1631,7 @@ impl<A, B, LenTB, SB> PartialEq<VecInner<B, LenTB, SB>> for [A]
 where
     A: PartialEq<B>,
     LenTB: LenType,
-    SB: VecStorage<B>,
+    SB: VecStorage<B> + ?Sized,
 {
     fn eq(&self, other: &VecInner<B, LenTB, SB>) -> bool {
         self.eq(other.as_slice())
@@ -1642,7 +1642,7 @@ impl<A, B, LenTB, SB> PartialEq<VecInner<B, LenTB, SB>> for &[A]
 where
     A: PartialEq<B>,
     LenTB: LenType,
-    SB: VecStorage<B>,
+    SB: VecStorage<B> + ?Sized,
 {
     fn eq(&self, other: &VecInner<B, LenTB, SB>) -> bool {
         (*self).eq(other)