wtf is wrong with the space eating

Cargo.lock

@@ -639,7 +639,7 @@ dependencies = [
 
 [[package]]
 name = "markov"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
  "async-compression",
  "cfg-if 1.0.0",

src/feed.rs

@@ -15,10 +15,12 @@ pub async fn full(who: &IpAddr, state: State, mut body: impl Unpin + Stream<Item
     while let Some(buf) = body.next().await {
 	let mut body = buf.map_err(|_| FillBodyError)?;
 	while body.has_remaining() {
-	    buffer.extend_from_slice(body.bytes());
+	    if body.bytes().len() > 0 {
-            let cnt = body.bytes().len();
+		buffer.extend_from_slice(body.bytes()); // XXX: what the fuck is wrong with this??? why it eat spaces????
-            body.advance(cnt);
+		let cnt = body.bytes().len();
-	    written += cnt;
+		body.advance(cnt);
+		written += cnt;
+	    }
 	}
     }
     if !buffer.ends_with(&[b'\n']) { // probably useless eh?