Serializing a RoaringBitmap into a Vec cannot fail

milli/src/heed_codec/roaring_bitmap/cbo_roaring_bitmap_codec.rs

@@ -23,18 +23,17 @@ impl CboRoaringBitmapCodec {
         }
     }
 
-    pub fn serialize_into(roaring: &RoaringBitmap, vec: &mut Vec<u8>) -> io::Result<()> {
+    pub fn serialize_into(roaring: &RoaringBitmap, vec: &mut Vec<u8>) {
         if roaring.len() <= THRESHOLD as u64 {
             // If the number of items (u32s) to encode is less than or equal to the threshold
             // it means that it would weigh the same or less than the RoaringBitmap
             // header, so we directly encode them using ByteOrder instead.
             for integer in roaring {
-                vec.write_u32::<NativeEndian>(integer)?;
+                vec.write_u32::<NativeEndian>(integer).unwrap();
             }
-            Ok(())
         } else {
             // Otherwise, we use the classic RoaringBitmapCodec that writes a header.
-            roaring.serialize_into(vec)
+            roaring.serialize_into(vec).unwrap();
         }
     }
 
@@ -68,7 +67,7 @@ impl heed::BytesEncode<'_> for CboRoaringBitmapCodec {
 
     fn bytes_encode(item: &Self::EItem) -> Option<Cow<[u8]>> {
         let mut vec = Vec::with_capacity(Self::serialized_size(item));
-        Self::serialize_into(item, &mut vec).ok()?;
+        Self::serialize_into(item, &mut vec);
         Some(Cow::Owned(vec))
     }
 }