Exclude namespace from tag name when comparing against field names

src/de/map.rs

@@ -789,7 +789,7 @@ fn not_in(
  start: &BytesStart,
  decoder: Decoder,
 ) -> Result<bool, DeError> {
- let tag = decoder.decode(start.name().into_inner())?;
+ let tag = decoder.decode(start.local_name().into_inner())?;
 
  Ok(fields.iter().all(|&field| field != tag.as_ref()))
 }