message: Add into_plain back, with deprecated attribute
diff: @@ -306,6 +306,12 @@ impl CBytes {
  Some(bytes) => bytes.is_empty(),
  }
  }
  +
  + #[inline]
  + #[deprecated(note = "Use into_bytes().")]
  + pub fn into_plain(self) -> Option<Vec<u8>> {
  + self.bytes
  + }
  }
  impl FromCursor for CBytes {
  @@ -362,6 +368,12 @@ impl CBytesShort {
  0
  }
  }
  +
  + #[inline]
  + #[deprecated(note = "Use into_bytes().")]
  + pub fn into_plain(self) -> Option<Vec<u8>> {
  + self.bytes
  + }
  }
  impl FromCursor for CBytesShort {
  