Remove old single-character special case. Word8Vector.vector is implemented as a string but the old single-character case had not been removed when it was removed from strings.
Remove old single-character special case.
Word8Vector.vector is implemented as a string but the old single-character case had not been removed when it was removed from strings.

polyml/polyml,dcjm/polyml,polyml/polyml,dcjm/polyml,polyml/polyml,dcjm/polyml,polyml/polyml,dcjm/polyml