message: Fixed
  Removed references to u8 and old documentation
diff: @@ -3,12 +3,8 @@ use std::io;
  use std::io::Read;
  use std::io::Write;
  -/// `Field` is actually a `u8` identifying a `Field`
  -/// The schema is in charge of holding mapping between field names
  -/// to `Field` objects.
  -///
  -/// Because the field id is a `u8`, tantivy can only have at most `255` fields.
  -/// Value 255 is reserved.
  +/// `Field` is represented by an unsigned 32-bit integer type
  +/// The schema holds the mapping between field names and `Field` objects.
  #[derive(Copy, Clone, Debug, PartialEq, PartialOrd, Eq, Ord, Hash, Serialize, Deserialize)]
  pub struct Field(pub u32);
  